656 lines
16 KiB
C
656 lines
16 KiB
C
/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2019-11-01 Jesven The first version
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* 2022-12-13 WangXiaoyao Hot-pluggable, extensible
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* page management algorithm
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*/
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#include <rtthread.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <string.h>
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#include "mm_fault.h"
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#include "mm_private.h"
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#include "mm_aspace.h"
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#include "mm_flag.h"
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#include "mm_page.h"
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#include <mmu.h>
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#define DBG_TAG "mm.page"
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#define DBG_LVL DBG_WARNING
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#include <rtdbg.h>
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RT_CTASSERT(order_huge_pg, RT_PAGE_MAX_ORDER > ARCH_PAGE_SHIFT - 2);
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RT_CTASSERT(size_width, sizeof(rt_size_t) == sizeof(void *));
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#ifdef RT_USING_SMART
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#include "lwp_arch_comm.h"
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#endif /* RT_USING_SMART */
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static rt_size_t init_mpr_align_start;
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static rt_size_t init_mpr_align_end;
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static void *init_mpr_cont_start;
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static struct rt_varea mpr_varea;
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static struct rt_page *page_list[RT_PAGE_MAX_ORDER];
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#define page_start ((rt_page_t)rt_mpr_start)
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static rt_size_t page_nr;
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static rt_size_t early_offset;
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static const char *get_name(rt_varea_t varea)
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{
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return "master-page-record";
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}
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static void hint_free(rt_mm_va_hint_t hint)
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{
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hint->flags = MMF_MAP_FIXED;
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hint->limit_start = rt_kernel_space.start;
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hint->limit_range_size = rt_kernel_space.size;
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hint->prefer = rt_mpr_start;
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}
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static void on_page_fault(struct rt_varea *varea, struct rt_mm_fault_msg *msg)
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{
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void *init_start = (void *)init_mpr_align_start;
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void *init_end = (void *)init_mpr_align_end;
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if (msg->vaddr < init_end && msg->vaddr >= init_start)
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{
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rt_size_t offset = msg->vaddr - init_start;
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msg->response.status = MM_FAULT_STATUS_OK;
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msg->response.vaddr = init_mpr_cont_start + offset;
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msg->response.size = ARCH_PAGE_SIZE;
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}
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else
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{
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void *raw_page = rt_pages_alloc(0);
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msg->response.status = MM_FAULT_STATUS_OK;
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msg->response.vaddr = raw_page;
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msg->response.size = ARCH_PAGE_SIZE;
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}
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}
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static struct rt_mem_obj mm_page_mapper = {
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.get_name = get_name,
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.on_page_fault = on_page_fault,
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.hint_free = hint_free,
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};
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static inline void *page_to_addr(rt_page_t page)
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{
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return (void *)((page - page_start) << ARCH_PAGE_SHIFT) - PV_OFFSET;
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}
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static inline rt_page_t addr_to_page(rt_page_t pg_start, void *addr)
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{
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addr += PV_OFFSET;
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return &pg_start[((uintptr_t)addr >> ARCH_PAGE_SHIFT)];
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}
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#define FLOOR(val, align) (((rt_size_t)(val) + (align)-1) & ~((align)-1))
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const rt_size_t shadow_mask =
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((1ul << (RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1)) - 1);
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const rt_size_t rt_mpr_size = FLOOR(
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((1ul << (ARCH_VADDR_WIDTH - ARCH_PAGE_SHIFT))) * sizeof(struct rt_page),
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ARCH_PAGE_SIZE);
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void *rt_mpr_start;
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rt_weak int rt_hw_clz(unsigned long n)
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{
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return __builtin_clzl(n);
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}
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rt_weak int rt_hw_ctz(unsigned long n)
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{
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return __builtin_ctzl(n);
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}
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rt_size_t rt_page_bits(rt_size_t size)
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{
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int bit = sizeof(rt_size_t) * 8 - rt_hw_clz(size) - 1;
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if ((size ^ (1UL << bit)) != 0)
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{
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bit++;
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}
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bit -= ARCH_PAGE_SHIFT;
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if (bit < 0)
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{
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bit = 0;
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}
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return bit;
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}
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struct rt_page *rt_page_addr2page(void *addr)
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{
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return addr_to_page(page_start, addr);
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}
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void *rt_page_page2addr(struct rt_page *p)
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{
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return page_to_addr(p);
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}
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static inline struct rt_page *buddy_get(struct rt_page *p,
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rt_uint32_t size_bits)
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{
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rt_size_t addr;
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addr = (rt_size_t)rt_page_page2addr(p);
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addr ^= (1UL << (size_bits + ARCH_PAGE_SHIFT));
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return rt_page_addr2page((void *)addr);
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}
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static void page_remove(struct rt_page *p, rt_uint32_t size_bits)
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{
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if (p->pre)
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{
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p->pre->next = p->next;
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}
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else
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{
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page_list[size_bits] = p->next;
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}
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if (p->next)
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{
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p->next->pre = p->pre;
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}
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p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
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}
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static void page_insert(struct rt_page *p, rt_uint32_t size_bits)
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{
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p->next = page_list[size_bits];
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if (p->next)
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{
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p->next->pre = p;
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}
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p->pre = 0;
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page_list[size_bits] = p;
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p->size_bits = size_bits;
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}
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static void _pages_ref_inc(struct rt_page *p, rt_uint32_t size_bits)
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{
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struct rt_page *page_head;
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int idx;
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/* find page group head */
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idx = p - page_start;
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idx = idx & ~((1UL << size_bits) - 1);
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page_head = page_start + idx;
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page_head = (void *)page_head + early_offset;
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page_head->ref_cnt++;
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}
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static int _pages_ref_get(struct rt_page *p, rt_uint32_t size_bits)
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{
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struct rt_page *page_head;
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int idx;
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/* find page group head */
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idx = p - page_start;
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idx = idx & ~((1UL << size_bits) - 1);
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page_head = page_start + idx;
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return page_head->ref_cnt;
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}
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static int _pages_free(struct rt_page *p, rt_uint32_t size_bits)
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{
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rt_uint32_t level = size_bits;
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struct rt_page *buddy;
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RT_ASSERT(p >= page_start);
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RT_ASSERT((void *)p < rt_mpr_start + rt_mpr_size);
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RT_ASSERT(rt_kmem_v2p(p));
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RT_ASSERT(p->ref_cnt > 0);
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RT_ASSERT(p->size_bits == ARCH_ADDRESS_WIDTH_BITS);
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RT_ASSERT(size_bits < RT_PAGE_MAX_ORDER);
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p->ref_cnt--;
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if (p->ref_cnt != 0)
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{
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return 0;
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}
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while (level < RT_PAGE_MAX_ORDER - 1)
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{
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buddy = buddy_get(p, level);
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if (buddy && buddy->size_bits == level)
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{
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page_remove(buddy, level);
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p = (p < buddy) ? p : buddy;
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level++;
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}
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else
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{
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break;
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}
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}
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page_insert(p, level);
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return 1;
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}
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static struct rt_page *_pages_alloc(rt_uint32_t size_bits)
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{
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struct rt_page *p;
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if (page_list[size_bits])
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{
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p = page_list[size_bits];
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page_remove(p, size_bits);
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}
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else
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{
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rt_uint32_t level;
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for (level = size_bits + 1; level < RT_PAGE_MAX_ORDER; level++)
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{
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if (page_list[level])
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{
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break;
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}
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}
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if (level == RT_PAGE_MAX_ORDER)
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{
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return 0;
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}
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p = page_list[level];
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page_remove(p, level);
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while (level > size_bits)
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{
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page_insert(p, level - 1);
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p = buddy_get(p, level - 1);
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level--;
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}
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}
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p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
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p->ref_cnt = 1;
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return p;
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}
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static void _early_page_remove(rt_page_t page, rt_uint32_t size_bits)
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{
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rt_page_t page_cont = (void *)page + early_offset;
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if (page_cont->pre)
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{
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rt_page_t pre_cont = (void *)page_cont->pre + early_offset;
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pre_cont->next = page_cont->next;
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}
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else
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{
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page_list[size_bits] = page_cont->next;
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}
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if (page_cont->next)
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{
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rt_page_t next_cont = (void *)page_cont->next + early_offset;
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next_cont->pre = page_cont->pre;
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}
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page_cont->size_bits = ARCH_ADDRESS_WIDTH_BITS;
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}
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static void _early_page_insert(rt_page_t page, int size_bits)
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{
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RT_ASSERT((void *)page >= rt_mpr_start &&
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(void *)page - rt_mpr_start < +rt_mpr_size);
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rt_page_t page_cont = (void *)page + early_offset;
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page_cont->next = page_list[size_bits];
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if (page_cont->next)
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{
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rt_page_t next_cont = (void *)page_cont->next + early_offset;
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next_cont->pre = page;
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}
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page_cont->pre = 0;
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page_list[size_bits] = page;
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page_cont->size_bits = size_bits;
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}
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static struct rt_page *_early_pages_alloc(rt_uint32_t size_bits)
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{
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struct rt_page *p;
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if (page_list[size_bits])
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{
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p = page_list[size_bits];
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_early_page_remove(p, size_bits);
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}
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else
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{
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rt_uint32_t level;
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for (level = size_bits + 1; level < RT_PAGE_MAX_ORDER; level++)
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{
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if (page_list[level])
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{
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break;
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}
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}
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if (level == RT_PAGE_MAX_ORDER)
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{
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return 0;
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}
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p = page_list[level];
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_early_page_remove(p, level);
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while (level > size_bits)
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{
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_early_page_insert(p, level - 1);
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p = buddy_get(p, level - 1);
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level--;
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}
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}
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rt_page_t page_cont = (void *)p + early_offset;
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page_cont->size_bits = ARCH_ADDRESS_WIDTH_BITS;
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page_cont->ref_cnt = 1;
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return p;
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}
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int rt_page_ref_get(void *addr, rt_uint32_t size_bits)
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{
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struct rt_page *p;
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rt_base_t level;
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int ref;
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p = rt_page_addr2page(addr);
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level = rt_hw_interrupt_disable();
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ref = _pages_ref_get(p, size_bits);
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rt_hw_interrupt_enable(level);
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return ref;
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}
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void rt_page_ref_inc(void *addr, rt_uint32_t size_bits)
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{
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struct rt_page *p;
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rt_base_t level;
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p = rt_page_addr2page(addr);
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level = rt_hw_interrupt_disable();
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_pages_ref_inc(p, size_bits);
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rt_hw_interrupt_enable(level);
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}
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static rt_page_t (*pages_alloc_handler)(rt_uint32_t size_bits);
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void *rt_pages_alloc(rt_uint32_t size_bits)
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{
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void *alloc_buf = RT_NULL;
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struct rt_page *p;
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rt_base_t level;
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level = rt_hw_interrupt_disable();
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p = pages_alloc_handler(size_bits);
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rt_hw_interrupt_enable(level);
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if (p)
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{
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alloc_buf = page_to_addr(p);
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}
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return alloc_buf;
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}
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int rt_pages_free(void *addr, rt_uint32_t size_bits)
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{
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struct rt_page *p;
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int real_free = 0;
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p = rt_page_addr2page(addr);
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if (p)
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{
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rt_base_t level;
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level = rt_hw_interrupt_disable();
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real_free = _pages_free(p, size_bits);
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rt_hw_interrupt_enable(level);
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}
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return real_free;
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}
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void rt_page_list(void) __attribute__((alias("list_page")));
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void list_page(void)
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{
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int i;
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rt_size_t total = 0;
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rt_base_t level;
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level = rt_hw_interrupt_disable();
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for (i = 0; i < RT_PAGE_MAX_ORDER; i++)
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{
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struct rt_page *p = page_list[i];
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rt_kprintf("level %d ", i);
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while (p)
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{
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total += (1UL << i);
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rt_kprintf("[0x%08p]", rt_page_page2addr(p));
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p = p->next;
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}
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rt_kprintf("\n");
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}
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rt_hw_interrupt_enable(level);
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rt_kprintf("free pages is 0x%08lx (%ld KB)\n", total, total * ARCH_PAGE_SIZE / 1024);
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rt_kprintf("-------------------------------\n");
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}
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MSH_CMD_EXPORT(list_page, show page info);
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void rt_page_get_info(rt_size_t *total_nr, rt_size_t *free_nr)
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{
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int i;
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rt_size_t total_free = 0;
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rt_base_t level;
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level = rt_hw_interrupt_disable();
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for (i = 0; i < RT_PAGE_MAX_ORDER; i++)
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{
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struct rt_page *p = page_list[i];
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while (p)
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{
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total_free += (1UL << i);
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p = p->next;
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}
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}
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rt_hw_interrupt_enable(level);
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*total_nr = page_nr;
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*free_nr = total_free;
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}
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void rt_page_init(rt_region_t reg)
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{
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int i;
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rt_region_t shadow;
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/* inclusive start, exclusive end */
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reg.start += ARCH_PAGE_MASK;
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reg.start &= ~ARCH_PAGE_MASK;
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reg.end &= ~ARCH_PAGE_MASK;
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if (reg.end <= reg.start)
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{
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LOG_E("region end(%p) must greater than start(%p)", reg.start, reg.end);
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RT_ASSERT(0);
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}
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page_nr = ((reg.end - reg.start) >> ARCH_PAGE_SHIFT);
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shadow.start = reg.start & ~shadow_mask;
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shadow.end = FLOOR(reg.end, shadow_mask + 1);
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LOG_D("[Init page] start: 0x%lx, end: 0x%lx, total: 0x%lx", reg.start,
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reg.end, page_nr);
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int err;
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/* init free list */
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for (i = 0; i < RT_PAGE_MAX_ORDER; i++)
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{
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page_list[i] = 0;
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}
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/* map MPR area */
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err = rt_aspace_map_static(&rt_kernel_space, &mpr_varea, &rt_mpr_start,
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rt_mpr_size, MMU_MAP_K_RWCB, MMF_MAP_FIXED,
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&mm_page_mapper, 0);
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if (err != RT_EOK)
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{
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LOG_E("MPR map failed with size %lx at %p", rt_mpr_size, rt_mpr_start);
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RT_ASSERT(0);
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}
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/* calculate footprint */
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init_mpr_align_start =
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(rt_size_t)addr_to_page(page_start, (void *)shadow.start) &
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~ARCH_PAGE_MASK;
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init_mpr_align_end =
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FLOOR(addr_to_page(page_start, (void *)shadow.end), ARCH_PAGE_SIZE);
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rt_size_t init_mpr_size = init_mpr_align_end - init_mpr_align_start;
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rt_size_t init_mpr_npage = init_mpr_size >> ARCH_PAGE_SHIFT;
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init_mpr_cont_start = (void *)reg.start;
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void *init_mpr_cont_end = init_mpr_cont_start + init_mpr_size;
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early_offset = init_mpr_cont_start - (void *)init_mpr_align_start;
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rt_page_t mpr_cont = rt_mpr_start + early_offset;
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/* mark init mpr pages as illegal */
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rt_page_t head_cont = addr_to_page(mpr_cont, (void *)reg.start);
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rt_page_t tail_cont = addr_to_page(mpr_cont, (void *)reg.end);
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for (rt_page_t iter = head_cont; iter < tail_cont; iter++)
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{
|
|
iter->size_bits = ARCH_ADDRESS_WIDTH_BITS;
|
|
}
|
|
|
|
/* mark shadow pages as illegal */
|
|
rt_page_t shad_head_cont = addr_to_page(mpr_cont, (void *)shadow.start);
|
|
for (rt_page_t iter = shad_head_cont; iter < head_cont; iter++)
|
|
{
|
|
iter->size_bits = ARCH_ADDRESS_WIDTH_BITS;
|
|
}
|
|
rt_page_t shad_tail_cont = addr_to_page(mpr_cont, (void *)shadow.end);
|
|
for (rt_page_t iter = tail_cont; iter < shad_tail_cont; iter++)
|
|
{
|
|
iter->size_bits = ARCH_ADDRESS_WIDTH_BITS;
|
|
}
|
|
|
|
/* insert reserved pages to list */
|
|
reg.start = (rt_size_t)init_mpr_cont_end;
|
|
const int max_order = RT_PAGE_MAX_ORDER + ARCH_PAGE_SHIFT - 1;
|
|
while (reg.start != reg.end)
|
|
{
|
|
struct rt_page *p;
|
|
int align_bits;
|
|
int size_bits;
|
|
|
|
size_bits =
|
|
ARCH_ADDRESS_WIDTH_BITS - 1 - rt_hw_clz(reg.end - reg.start);
|
|
align_bits = rt_hw_ctz(reg.start);
|
|
if (align_bits < size_bits)
|
|
{
|
|
size_bits = align_bits;
|
|
}
|
|
if (size_bits > max_order)
|
|
{
|
|
size_bits = max_order;
|
|
}
|
|
|
|
p = addr_to_page(mpr_cont, (void *)reg.start);
|
|
p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
|
|
p->ref_cnt = 0;
|
|
|
|
/* insert to list */
|
|
_early_page_insert((void *)p - early_offset,
|
|
size_bits - ARCH_PAGE_SHIFT);
|
|
reg.start += (1UL << size_bits);
|
|
}
|
|
|
|
pages_alloc_handler = _early_pages_alloc;
|
|
/* doing the page table bushiness */
|
|
if (rt_aspace_load_page(&rt_kernel_space, (void *)init_mpr_align_start, init_mpr_npage))
|
|
{
|
|
LOG_E("%s: failed to load pages", __func__);
|
|
RT_ASSERT(0);
|
|
}
|
|
|
|
if (rt_hw_mmu_tbl_get() == rt_kernel_space.page_table)
|
|
rt_page_cleanup();
|
|
}
|
|
|
|
static int _load_mpr_area(void *head, void *tail)
|
|
{
|
|
int err = 0;
|
|
void *iter = (void *)((uintptr_t)head & ~ARCH_PAGE_MASK);
|
|
tail = (void *)FLOOR(tail, ARCH_PAGE_SIZE);
|
|
|
|
while (iter != tail)
|
|
{
|
|
void *paddr = rt_kmem_v2p(iter);
|
|
if (paddr == ARCH_MAP_FAILED)
|
|
{
|
|
err = rt_aspace_load_page(&rt_kernel_space, iter, 1);
|
|
if (err != RT_EOK)
|
|
{
|
|
LOG_E("%s: failed to load page", __func__);
|
|
break;
|
|
}
|
|
}
|
|
iter += ARCH_PAGE_SIZE;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int rt_page_install(rt_region_t region)
|
|
{
|
|
int err = -RT_EINVAL;
|
|
if (region.end != region.start && !(region.start & ARCH_PAGE_MASK) &&
|
|
!(region.end & ARCH_PAGE_MASK) &&
|
|
!((region.end - region.start) & shadow_mask))
|
|
{
|
|
void *head = addr_to_page(page_start, (void *)region.start);
|
|
void *tail = addr_to_page(page_start, (void *)region.end);
|
|
|
|
page_nr += ((region.end - region.start) >> ARCH_PAGE_SHIFT);
|
|
|
|
err = _load_mpr_area(head, tail);
|
|
|
|
if (err == RT_EOK)
|
|
{
|
|
while (region.start != region.end)
|
|
{
|
|
struct rt_page *p;
|
|
int size_bits;
|
|
|
|
size_bits = RT_PAGE_MAX_ORDER - 1;
|
|
p = addr_to_page(page_start, (void *)region.start);
|
|
p->size_bits = ARCH_ADDRESS_WIDTH_BITS;
|
|
p->ref_cnt = 1;
|
|
|
|
_pages_free(p, size_bits);
|
|
region.start += (1UL << (size_bits + ARCH_PAGE_SHIFT));
|
|
}
|
|
}
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void rt_page_cleanup(void)
|
|
{
|
|
early_offset = 0;
|
|
pages_alloc_handler = _pages_alloc;
|
|
}
|