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rt-thread/libcpu/arm/cortex-a/mmu.c

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/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2012-01-10 bernard porting to AM1808
* 2023-10-10 Shell Add permission control API
*/
#include <rthw.h>
#include <rtthread.h>
#define DBG_TAG "hw.mmu"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
#include <board.h>
#include "cp15.h"
#include "mm_page.h"
#include "mmu.h"
#include <mm_aspace.h>
#include <tlb.h>
#ifdef RT_USING_SMART
#include <lwp_mm.h>
#include <lwp_arch.h>
#include "ioremap.h"
#else
#define KERNEL_VADDR_START 0
#endif
/* level1 page table, each entry for 1MB memory. */
volatile unsigned long MMUTable[4 * 1024] __attribute__((aligned(16 * 1024)));
unsigned long rt_hw_set_domain_register(unsigned long domain_val)
{
unsigned long old_domain;
asm volatile ("mrc p15, 0, %0, c3, c0\n" : "=r" (old_domain));
asm volatile ("mcr p15, 0, %0, c3, c0\n" : :"r" (domain_val) : "memory");
return old_domain;
}
void rt_hw_mmu_setmtt(rt_uint32_t vaddrStart, rt_uint32_t vaddrEnd,
rt_uint32_t paddrStart, rt_uint32_t attr)
{
volatile rt_uint32_t *pTT;
volatile int i, nSec;
pTT = (rt_uint32_t *)MMUTable + (vaddrStart >> 20);
nSec = (vaddrEnd >> 20) - (vaddrStart >> 20);
for(i = 0; i <= nSec; i++)
{
*pTT = attr | (((paddrStart >> 20) + i) << 20);
pTT++;
}
}
void init_mm_setup(unsigned int *mtbl, unsigned int size, unsigned int pv_off)
{
unsigned int va;
for (va = 0; va < 0x1000; va++)
{
unsigned int vaddr = (va << 20);
if (vaddr >= KERNEL_VADDR_START && vaddr - KERNEL_VADDR_START < size)
{
mtbl[va] = ((va << 20) + pv_off) | NORMAL_MEM;
}
else if (vaddr >= (KERNEL_VADDR_START + pv_off) && vaddr - (KERNEL_VADDR_START + pv_off) < size)
{
mtbl[va] = (va << 20) | NORMAL_MEM;
}
else
{
mtbl[va] = 0;
}
}
}
#ifndef RT_USING_SMART
static void _init_map_section(rt_uint32_t *mmu_table, rt_uint32_t va,
rt_uint32_t size,rt_uint32_t pa, rt_uint32_t attr)
{
volatile rt_uint32_t *ptt;
volatile int i, num_section;
ptt = (rt_uint32_t *)mmu_table + (va >> ARCH_SECTION_SHIFT);
num_section = size >> ARCH_SECTION_SHIFT;
for(i = 0; i <= num_section; i++)
{
*ptt = attr | (((pa >> ARCH_SECTION_SHIFT) + i) << ARCH_SECTION_SHIFT);
ptt++;
}
}
#endif
void rt_hw_mem_setup_early(rt_uint32_t *early_mmu_talbe,
rt_uint32_t pv_off)
{
rt_uint32_t size = 0;
size = 0x100000 + (rt_uint32_t)&__bss_end;
size &= ~(0x100000 - 1);
#ifdef RT_USING_SMART
size -= KERNEL_VADDR_START;
init_mm_setup(early_mmu_talbe, size, pv_off);
#else
rt_uint32_t normal_attr = NORMAL_MEM;
extern unsigned char _reset;
rt_uint32_t va = (rt_uint32_t) &_reset;
/* The starting virtual address is aligned along 0x1000000. */
va &= (0x1000000 - 1);
size -= va;
_init_map_section(early_mmu_talbe, va, size, va + pv_off, normal_attr);
#endif
}
void rt_hw_init_mmu_table(struct mem_desc *mdesc, rt_uint32_t size)
{
void *vaddr;
size_t length;
/* init kernel space */
#ifdef RT_USING_SMART
rt_aspace_init(&rt_kernel_space, (void *)USER_VADDR_TOP, -USER_VADDR_TOP, (void *)MMUTable);
#else
rt_aspace_init(&rt_kernel_space, (void *)0x1000, 0 - 0x1000, (void *)MMUTable);
#endif /* RT_USING_SMART */
/* set page table */
for(; size > 0; size--)
{
if (mdesc->paddr_start == (rt_uint32_t)ARCH_MAP_FAILED)
mdesc->paddr_start = mdesc->vaddr_start + PV_OFFSET;
vaddr = (void *)mdesc->vaddr_start;
length = mdesc->vaddr_end - mdesc->vaddr_start;
rt_aspace_map_static(&rt_kernel_space, &mdesc->varea, &vaddr, length,
mdesc->attr, MMF_MAP_FIXED, &rt_mm_dummy_mapper, 0);
rt_hw_mmu_setmtt(mdesc->vaddr_start, mdesc->vaddr_end,
mdesc->paddr_start, mdesc->attr);
mdesc++;
}
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, (void*)MMUTable, sizeof MMUTable);
}
void rt_hw_mmu_init(void)
{
rt_cpu_dcache_clean_flush();
rt_cpu_icache_flush();
rt_hw_cpu_dcache_disable();
rt_hw_cpu_icache_disable();
rt_cpu_mmu_disable();
/*rt_hw_cpu_dump_page_table(MMUTable);*/
rt_hw_set_domain_register(0x55555555);
rt_cpu_tlb_set(MMUTable);
rt_cpu_mmu_enable();
rt_hw_cpu_icache_enable();
rt_hw_cpu_dcache_enable();
}
int rt_hw_mmu_map_init(struct rt_aspace *aspace, void* v_address, size_t size, size_t *vtable, size_t pv_off)
{
size_t l1_off, va_s, va_e;
if (!aspace || !vtable)
{
return -1;
}
va_s = (size_t)v_address;
va_e = (size_t)v_address + size - 1;
if ( va_e < va_s)
{
return -1;
}
va_s >>= ARCH_SECTION_SHIFT;
va_e >>= ARCH_SECTION_SHIFT;
if (va_s == 0)
{
return -1;
}
for (l1_off = va_s; l1_off <= va_e; l1_off++)
{
size_t v = vtable[l1_off];
if (v & ARCH_MMU_USED_MASK)
{
return -1;
}
}
#ifdef RT_USING_SMART
rt_ioremap_start = v_address;
rt_ioremap_size = size;
rt_mpr_start = rt_ioremap_start - rt_mpr_size;
#else
rt_mpr_start = (void *)((rt_size_t)0 - rt_mpr_size);
#endif
return 0;
}
int rt_hw_mmu_ioremap_init(rt_aspace_t aspace, void* v_address, size_t size)
{
#ifdef RT_IOREMAP_LATE
size_t loop_va;
size_t l1_off;
size_t *mmu_l1, *mmu_l2;
size_t sections;
/* for kernel ioremap */
if ((size_t)v_address < KERNEL_VADDR_START)
{
return -1;
}
/* must align to section */
if ((size_t)v_address & ARCH_SECTION_MASK)
{
return -1;
}
/* must align to section */
if (size & ARCH_SECTION_MASK)
{
return -1;
}
loop_va = (size_t)v_address;
sections = (size >> ARCH_SECTION_SHIFT);
while (sections--)
{
l1_off = (loop_va >> ARCH_SECTION_SHIFT);
mmu_l1 = (size_t*)aspace->page_table + l1_off;
RT_ASSERT((*mmu_l1 & ARCH_MMU_USED_MASK) == 0);
mmu_l2 = (size_t*)rt_pages_alloc(0);
if (mmu_l2)
{
rt_memset(mmu_l2, 0, ARCH_PAGE_TBL_SIZE * 2);
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l2, ARCH_PAGE_TBL_SIZE);
*mmu_l1 = (((size_t)mmu_l2 + PV_OFFSET) | 0x1);
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l1, 4);
}
else
{
/* error */
return -1;
}
loop_va += ARCH_SECTION_SIZE;
}
#endif
return 0;
}
static void _kenrel_unmap_4K(unsigned long *lv0_tbl, void *v_addr)
{
size_t loop_va = (size_t)v_addr & ~ARCH_PAGE_MASK;
size_t l1_off, l2_off;
size_t *mmu_l1, *mmu_l2;
l1_off = (loop_va >> ARCH_SECTION_SHIFT);
l2_off = ((loop_va & ARCH_SECTION_MASK) >> ARCH_PAGE_SHIFT);
mmu_l1 = (size_t *)lv0_tbl + l1_off;
if (*mmu_l1 & ARCH_MMU_USED_MASK)
{
mmu_l2 = (size_t *)((*mmu_l1 & ~ARCH_PAGE_TBL_MASK) - PV_OFFSET);
}
else
{
return;
}
if (*(mmu_l2 + l2_off) & ARCH_MMU_USED_MASK)
{
*(mmu_l2 + l2_off) = 0;
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l2 + l2_off, 4);
if (rt_pages_free(mmu_l2, 0))
{
*mmu_l1 = 0;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l1, 4);
}
}
loop_va += ARCH_PAGE_SIZE;
}
static int _kenrel_map_4K(unsigned long *lv0_tbl, void *v_addr, void *p_addr,
size_t attr)
{
size_t loop_va = (size_t)v_addr & ~ARCH_PAGE_MASK;
size_t loop_pa = (size_t)p_addr & ~ARCH_PAGE_MASK;
size_t l1_off, l2_off;
size_t *mmu_l1, *mmu_l2;
l1_off = (loop_va >> ARCH_SECTION_SHIFT);
l2_off = ((loop_va & ARCH_SECTION_MASK) >> ARCH_PAGE_SHIFT);
mmu_l1 = (size_t *)lv0_tbl + l1_off;
if (*mmu_l1 & ARCH_MMU_USED_MASK)
{
mmu_l2 = (size_t *)((*mmu_l1 & ~ARCH_PAGE_TBL_MASK) - PV_OFFSET);
rt_page_ref_inc(mmu_l2, 0);
}
else
{
mmu_l2 = (size_t *)rt_pages_alloc(0);
if (mmu_l2)
{
rt_memset(mmu_l2, 0, ARCH_PAGE_TBL_SIZE * 2);
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l2, ARCH_PAGE_TBL_SIZE);
*mmu_l1 = (((size_t)mmu_l2 + PV_OFFSET) | 0x1);
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l1, 4);
}
else
{
/* error, quit */
return -1;
}
}
*(mmu_l2 + l2_off) = (loop_pa | attr);
/* cache maintain */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_l2 + l2_off, 4);
loop_va += ARCH_PAGE_SIZE;
loop_pa += ARCH_PAGE_SIZE;
return 0;
}
void *rt_hw_mmu_map(rt_aspace_t aspace, void *v_addr, void *p_addr, size_t size,
size_t attr)
{
int ret = -1;
void *unmap_va = v_addr;
size_t npages = size >> ARCH_PAGE_SHIFT;
// TODO trying with HUGEPAGE here
while (npages--)
{
ret = _kenrel_map_4K(aspace->page_table, v_addr, p_addr, attr);
if (ret != 0)
{
/* error, undo map */
while (unmap_va != v_addr)
{
rt_enter_critical();
_kenrel_unmap_4K(aspace->page_table, (void *)unmap_va);
rt_exit_critical();
unmap_va += ARCH_PAGE_SIZE;
}
break;
}
v_addr += ARCH_PAGE_SIZE;
p_addr += ARCH_PAGE_SIZE;
}
if (ret == 0)
{
return v_addr;
}
return NULL;
}
void rt_hw_mmu_unmap(rt_aspace_t aspace, void *v_addr, size_t size)
{
// caller guarantee that v_addr & size are page aligned
size_t npages = size >> ARCH_PAGE_SHIFT;
if (!aspace->page_table)
{
return;
}
while (npages--)
{
rt_enter_critical();
_kenrel_unmap_4K(aspace->page_table, v_addr);
rt_exit_critical();
v_addr += ARCH_PAGE_SIZE;
}
}
void rt_hw_aspace_switch(rt_aspace_t aspace)
{
if (aspace != &rt_kernel_space)
{
void *pgtbl = aspace->page_table;
pgtbl = rt_kmem_v2p(pgtbl);
rt_hw_mmu_switch(pgtbl);
rt_hw_tlb_invalidate_all_local();
}
}
void *rt_hw_mmu_v2p(rt_aspace_t aspace, void* v_addr)
{
size_t l1_off, l2_off;
size_t *mmu_l1, *mmu_l2;
size_t tmp;
size_t pa;
l1_off = (size_t)v_addr >> ARCH_SECTION_SHIFT;
RT_ASSERT(aspace);
mmu_l1 = (size_t*)aspace->page_table + l1_off;
tmp = *mmu_l1;
switch (tmp & ARCH_MMU_USED_MASK)
{
case 0: /* not used */
break;
case 1: /* page table */
mmu_l2 = (size_t *)((tmp & ~ARCH_PAGE_TBL_MASK) - PV_OFFSET);
l2_off = (((size_t)v_addr & ARCH_SECTION_MASK) >> ARCH_PAGE_SHIFT);
pa = *(mmu_l2 + l2_off);
if (pa & ARCH_MMU_USED_MASK)
{
if ((pa & ARCH_MMU_USED_MASK) == 1)
{
/* large page, not support */
break;
}
pa &= ~(ARCH_PAGE_MASK);
pa += ((size_t)v_addr & ARCH_PAGE_MASK);
return (void*)pa;
}
break;
case 2:
case 3:
/* section */
if (tmp & ARCH_TYPE_SUPERSECTION)
{
/* super section, not support */
break;
}
pa = (tmp & ~ARCH_SECTION_MASK);
pa += ((size_t)v_addr & ARCH_SECTION_MASK);
return (void*)pa;
}
return ARCH_MAP_FAILED;
}
int rt_hw_mmu_control(struct rt_aspace *aspace, void *vaddr, size_t size,
enum rt_mmu_cntl cmd)
{
return -RT_ENOSYS;
}
#define KPTE_START (KERNEL_VADDR_START >> ARCH_SECTION_SHIFT)
void *rt_hw_mmu_pgtbl_create(void)
{
size_t *mmu_table;
mmu_table = (size_t *)rt_pages_alloc_ext(2, PAGE_ANY_AVAILABLE);
if (!mmu_table)
{
return RT_NULL;
}
rt_memcpy(mmu_table + KPTE_START, (size_t *)rt_kernel_space.page_table + KPTE_START, ARCH_PAGE_SIZE);
rt_memset(mmu_table, 0, 3 * ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, mmu_table, 4 * ARCH_PAGE_SIZE);
return mmu_table;
}
void rt_hw_mmu_pgtbl_delete(void *pgtbl)
{
rt_pages_free(pgtbl, 2);
}
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