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rt-thread-official/libcpu/aarch64/common/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
* 2021-11-28 GuEe-GUI first version
* 2022-12-10 WangXiaoyao porting to MM
*/
#include <rthw.h>
#include <rtthread.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "mm_aspace.h"
#include "mm_page.h"
#include "mmu.h"
#include "tlb.h"
#ifdef RT_USING_SMART
#include "ioremap.h"
#include <lwp_mm.h>
#endif
#define DBG_TAG "hw.mmu"
#define DBG_LVL DBG_LOG
#include <rtdbg.h>
#define MMU_LEVEL_MASK 0x1ffUL
#define MMU_LEVEL_SHIFT 9
#define MMU_ADDRESS_BITS 39
#define MMU_ADDRESS_MASK 0x0000fffffffff000UL
#define MMU_ATTRIB_MASK 0xfff0000000000ffcUL
#define MMU_TYPE_MASK 3UL
#define MMU_TYPE_USED 1UL
#define MMU_TYPE_BLOCK 1UL
#define MMU_TYPE_TABLE 3UL
#define MMU_TYPE_PAGE 3UL
#define MMU_TBL_BLOCK_2M_LEVEL 2
#define MMU_TBL_PAGE_4k_LEVEL 3
#define MMU_TBL_LEVEL_NR 4
volatile unsigned long MMUTable[512] __attribute__((aligned(4 * 1024)));
struct mmu_level_info
{
unsigned long *pos;
void *page;
};
static void _kenrel_unmap_4K(unsigned long *lv0_tbl, void *v_addr)
{
int level;
unsigned long va = (unsigned long)v_addr;
unsigned long *cur_lv_tbl = lv0_tbl;
unsigned long page;
unsigned long off;
struct mmu_level_info level_info[4];
int ref;
int level_shift = MMU_ADDRESS_BITS;
unsigned long *pos;
rt_memset(level_info, 0, sizeof level_info);
for (level = 0; level < MMU_TBL_LEVEL_NR; level++)
{
off = (va >> level_shift);
off &= MMU_LEVEL_MASK;
page = cur_lv_tbl[off];
if (!(page & MMU_TYPE_USED))
{
break;
}
if ((page & MMU_TYPE_MASK) == MMU_TYPE_BLOCK)
{
break;
}
/* next table entry in current level */
level_info[level].pos = cur_lv_tbl + off;
cur_lv_tbl = (unsigned long *)(page & MMU_ADDRESS_MASK);
cur_lv_tbl = (unsigned long *)((unsigned long)cur_lv_tbl - PV_OFFSET);
level_info[level].page = cur_lv_tbl;
level_shift -= MMU_LEVEL_SHIFT;
}
level = MMU_TBL_PAGE_4k_LEVEL;
pos = level_info[level].pos;
if (pos)
{
*pos = (unsigned long)RT_NULL;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, pos, sizeof(void *));
}
level--;
while (level >= 0)
{
pos = level_info[level].pos;
if (pos)
{
void *cur_page = level_info[level].page;
ref = rt_page_ref_get(cur_page, 0);
if (ref == 1)
{
*pos = (unsigned long)RT_NULL;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, pos, sizeof(void *));
}
rt_pages_free(cur_page, 0);
}
else
{
break;
}
level--;
}
return;
}
static int _kernel_map_4K(unsigned long *lv0_tbl, void *vaddr, void *paddr, unsigned long attr)
{
int ret = 0;
int level;
unsigned long *cur_lv_tbl = lv0_tbl;
unsigned long page;
unsigned long off;
intptr_t va = (intptr_t)vaddr;
intptr_t pa = (intptr_t)paddr;
int level_shift = MMU_ADDRESS_BITS;
if (va & ARCH_PAGE_MASK)
{
return MMU_MAP_ERROR_VANOTALIGN;
}
if (pa & ARCH_PAGE_MASK)
{
return MMU_MAP_ERROR_PANOTALIGN;
}
for (level = 0; level < MMU_TBL_PAGE_4k_LEVEL; level++)
{
off = (va >> level_shift);
off &= MMU_LEVEL_MASK;
if (!(cur_lv_tbl[off] & MMU_TYPE_USED))
{
page = (unsigned long)rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
if (!page)
{
ret = MMU_MAP_ERROR_NOPAGE;
goto err;
}
rt_memset((void *)page, 0, ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, (void *)page, ARCH_PAGE_SIZE);
cur_lv_tbl[off] = (page + PV_OFFSET) | MMU_TYPE_TABLE;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, cur_lv_tbl + off, sizeof(void *));
}
else
{
page = cur_lv_tbl[off];
page &= MMU_ADDRESS_MASK;
/* page to va */
page -= PV_OFFSET;
rt_page_ref_inc((void *)page, 0);
}
page = cur_lv_tbl[off];
if ((page & MMU_TYPE_MASK) == MMU_TYPE_BLOCK)
{
/* is block! error! */
ret = MMU_MAP_ERROR_CONFLICT;
goto err;
}
cur_lv_tbl = (unsigned long *)(page & MMU_ADDRESS_MASK);
cur_lv_tbl = (unsigned long *)((unsigned long)cur_lv_tbl - PV_OFFSET);
level_shift -= MMU_LEVEL_SHIFT;
}
/* now is level page */
attr &= MMU_ATTRIB_MASK;
pa |= (attr | MMU_TYPE_PAGE); /* page */
off = (va >> ARCH_PAGE_SHIFT);
off &= MMU_LEVEL_MASK;
cur_lv_tbl[off] = pa; /* page */
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, cur_lv_tbl + off, sizeof(void *));
return ret;
err:
_kenrel_unmap_4K(lv0_tbl, (void *)va);
return ret;
}
static int _kernel_map_2M(unsigned long *lv0_tbl, void *vaddr, void *paddr, unsigned long attr)
{
int ret = 0;
int level;
unsigned long *cur_lv_tbl = lv0_tbl;
unsigned long page;
unsigned long off;
unsigned long va = (unsigned long)vaddr;
unsigned long pa = (unsigned long)paddr;
int level_shift = MMU_ADDRESS_BITS;
if (va & ARCH_SECTION_MASK)
{
return MMU_MAP_ERROR_VANOTALIGN;
}
if (pa & ARCH_SECTION_MASK)
{
return MMU_MAP_ERROR_PANOTALIGN;
}
for (level = 0; level < MMU_TBL_BLOCK_2M_LEVEL; level++)
{
off = (va >> level_shift);
off &= MMU_LEVEL_MASK;
if (!(cur_lv_tbl[off] & MMU_TYPE_USED))
{
page = (unsigned long)rt_pages_alloc_ext(0, PAGE_ANY_AVAILABLE);
if (!page)
{
ret = MMU_MAP_ERROR_NOPAGE;
goto err;
}
rt_memset((char *)page, 0, ARCH_PAGE_SIZE);
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, (void *)page, ARCH_PAGE_SIZE);
cur_lv_tbl[off] = (page + PV_OFFSET) | MMU_TYPE_TABLE;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, cur_lv_tbl + off, sizeof(void *));
}
else
{
page = cur_lv_tbl[off];
page &= MMU_ADDRESS_MASK;
/* page to va */
page -= PV_OFFSET;
rt_page_ref_inc((void *)page, 0);
}
page = cur_lv_tbl[off];
if ((page & MMU_TYPE_MASK) == MMU_TYPE_BLOCK)
{
/* is block! error! */
ret = MMU_MAP_ERROR_CONFLICT;
goto err;
}
cur_lv_tbl = (unsigned long *)(page & MMU_ADDRESS_MASK);
cur_lv_tbl = (unsigned long *)((unsigned long)cur_lv_tbl - PV_OFFSET);
level_shift -= MMU_LEVEL_SHIFT;
}
/* now is level page */
attr &= MMU_ATTRIB_MASK;
pa |= (attr | MMU_TYPE_BLOCK); /* block */
off = (va >> ARCH_SECTION_SHIFT);
off &= MMU_LEVEL_MASK;
cur_lv_tbl[off] = pa;
rt_hw_cpu_dcache_ops(RT_HW_CACHE_FLUSH, cur_lv_tbl + off, sizeof(void *));
return ret;
err:
_kenrel_unmap_4K(lv0_tbl, (void *)va);
return ret;
}
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_t stride;
int (*mapper)(unsigned long *lv0_tbl, void *vaddr, void *paddr, unsigned long attr);
if (((rt_ubase_t)v_addr & ARCH_SECTION_MASK) || (size & ARCH_SECTION_MASK))
{
/* legacy 4k mapping */
npages = size >> ARCH_PAGE_SHIFT;
stride = ARCH_PAGE_SIZE;
mapper = _kernel_map_4K;
}
else
{
/* 2m huge page */
npages = size >> ARCH_SECTION_SHIFT;
stride = ARCH_SECTION_SIZE;
mapper = _kernel_map_2M;
}
while (npages--)
{
MM_PGTBL_LOCK(aspace);
ret = mapper(aspace->page_table, v_addr, p_addr, attr);
MM_PGTBL_UNLOCK(aspace);
if (ret != 0)
{
/* other types of return value are taken as programming error */
RT_ASSERT(ret == MMU_MAP_ERROR_NOPAGE);
/* error, undo map */
while (unmap_va != v_addr)
{
MM_PGTBL_LOCK(aspace);
_kenrel_unmap_4K(aspace->page_table, (void *)unmap_va);
MM_PGTBL_UNLOCK(aspace);
unmap_va = (char *)unmap_va + stride;
}
break;
}
v_addr = (char *)v_addr + stride;
p_addr = (char *)p_addr + stride;
}
if (ret == 0)
{
return unmap_va;
}
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--)
{
MM_PGTBL_LOCK(aspace);
if (rt_hw_mmu_v2p(aspace, v_addr) != ARCH_MAP_FAILED)
_kenrel_unmap_4K(aspace->page_table, v_addr);
MM_PGTBL_UNLOCK(aspace);
v_addr = (char *)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_ubase_t tcr;
__asm__ volatile("msr ttbr0_el1, %0" ::"r"(pgtbl) : "memory");
__asm__ volatile("mrs %0, tcr_el1" : "=r"(tcr));
tcr &= ~(1ul << 7);
__asm__ volatile("msr tcr_el1, %0\n"
"isb" ::"r"(tcr)
: "memory");
rt_hw_tlb_invalidate_all_local();
}
}
void rt_hw_mmu_ktbl_set(unsigned long tbl)
{
#ifdef RT_USING_SMART
tbl += PV_OFFSET;
__asm__ volatile("msr TTBR1_EL1, %0\n dsb sy\nisb" ::"r"(tbl) : "memory");
#else
__asm__ volatile("msr TTBR0_EL1, %0\n dsb sy\nisb" ::"r"(tbl) : "memory");
#endif
__asm__ volatile("tlbi vmalle1\n dsb sy\nisb" ::: "memory");
__asm__ volatile("ic ialluis\n dsb sy\nisb" ::: "memory");
}
/**
* @brief setup Page Table for kernel space. It's a fixed map
* and all mappings cannot be changed after initialization.
*
* Memory region in struct mem_desc must be page aligned,
* otherwise is a failure and no report will be
* returned.
*
* @param mmu_info
* @param mdesc
* @param desc_nr
*/
void rt_hw_mmu_setup(rt_aspace_t aspace, struct mem_desc *mdesc, int desc_nr)
{
void *err;
for (size_t i = 0; i < desc_nr; i++)
{
size_t attr;
switch (mdesc->attr)
{
case NORMAL_MEM:
attr = MMU_MAP_K_RWCB;
break;
case NORMAL_NOCACHE_MEM:
attr = MMU_MAP_K_RWCB;
break;
case DEVICE_MEM:
attr = MMU_MAP_K_DEVICE;
break;
default:
attr = MMU_MAP_K_DEVICE;
}
struct rt_mm_va_hint hint = {.flags = MMF_MAP_FIXED,
.limit_start = aspace->start,
.limit_range_size = aspace->size,
.map_size = mdesc->vaddr_end -
mdesc->vaddr_start + 1,
.prefer = (void *)mdesc->vaddr_start};
if (mdesc->paddr_start == (rt_size_t)ARCH_MAP_FAILED)
mdesc->paddr_start = mdesc->vaddr_start + PV_OFFSET;
int retval;
retval = rt_aspace_map_phy_static(aspace, &mdesc->varea, &hint, attr,
mdesc->paddr_start >> MM_PAGE_SHIFT, &err);
if (retval)
{
LOG_E("%s: map failed with code %d", retval);
RT_ASSERT(0);
}
mdesc++;
}
rt_hw_mmu_ktbl_set((unsigned long)rt_kernel_space.page_table);
rt_page_cleanup();
}
#ifdef RT_USING_SMART
static void _init_region(void *vaddr, size_t size)
{
rt_ioremap_start = vaddr;
rt_ioremap_size = size;
rt_mpr_start = (char *)rt_ioremap_start - rt_mpr_size;
}
#else
#define RTOS_VEND (0xfffffffff000UL)
static inline void _init_region(void *vaddr, size_t size)
{
rt_mpr_start = (void *)(RTOS_VEND - rt_mpr_size);
}
#endif
/**
* This function will initialize rt_mmu_info structure.
*
* @param mmu_info rt_mmu_info structure
* @param v_address virtual address
* @param size map size
* @param vtable mmu table
* @param pv_off pv offset in kernel space
*
* @return 0 on successful and -1 for fail
*/
int rt_hw_mmu_map_init(rt_aspace_t aspace, void *v_address, size_t size,
size_t *vtable, size_t pv_off)
{
size_t 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;
}
#ifdef RT_USING_SMART
rt_aspace_init(aspace, (void *)KERNEL_VADDR_START, 0 - KERNEL_VADDR_START,
vtable);
#else
rt_aspace_init(aspace, (void *)0x1000, RTOS_VEND - 0x1000ul, vtable);
#endif
_init_region(v_address, size);
return 0;
}
/************ setting el1 mmu register**************
MAIR_EL1
index 0 : memory outer writeback, write/read alloc
index 1 : memory nocache
index 2 : device nGnRnE
*****************************************************/
void mmu_tcr_init(void)
{
unsigned long val64;
val64 = 0x00447fUL;
__asm__ volatile("msr MAIR_EL1, %0\n dsb sy\n" ::"r"(val64));
/* TCR_EL1 */
val64 = (16UL << 0) /* t0sz 48bit */
| (0x0UL << 6) /* reserved */
| (0x0UL << 7) /* epd0 */
| (0x3UL << 8) /* t0 wb cacheable */
| (0x3UL << 10) /* inner shareable */
| (0x2UL << 12) /* t0 outer shareable */
| (0x0UL << 14) /* t0 4K */
| (16UL << 16) /* t1sz 48bit */
| (0x0UL << 22) /* define asid use ttbr0.asid */
| (0x0UL << 23) /* epd1 */
| (0x3UL << 24) /* t1 inner wb cacheable */
| (0x3UL << 26) /* t1 outer wb cacheable */
| (0x2UL << 28) /* t1 outer shareable */
| (0x2UL << 30) /* t1 4k */
| (0x1UL << 32) /* 001b 64GB PA */
| (0x0UL << 35) /* reserved */
| (0x1UL << 36) /* as: 0:8bit 1:16bit */
| (0x0UL << 37) /* tbi0 */
| (0x0UL << 38); /* tbi1 */
__asm__ volatile("msr TCR_EL1, %0\n" ::"r"(val64));
}
struct page_table
{
unsigned long page[512];
};
/* */
static struct page_table __init_page_array[6] rt_align(0x1000);
static unsigned long __page_off = 2UL; /* 0, 1 for ttbr0, ttrb1 */
unsigned long get_ttbrn_base(void)
{
return (unsigned long) __init_page_array;
}
unsigned long get_free_page(void)
{
__page_off++;
return (unsigned long) (__init_page_array[__page_off - 1].page);
}
static int _map_single_page_2M(unsigned long *lv0_tbl, unsigned long va,
unsigned long pa, unsigned long attr)
{
int level;
unsigned long *cur_lv_tbl = lv0_tbl;
unsigned long page;
unsigned long off;
int level_shift = MMU_ADDRESS_BITS;
if (va & ARCH_SECTION_MASK)
{
return MMU_MAP_ERROR_VANOTALIGN;
}
if (pa & ARCH_SECTION_MASK)
{
return MMU_MAP_ERROR_PANOTALIGN;
}
for (level = 0; level < MMU_TBL_BLOCK_2M_LEVEL; level++)
{
off = (va >> level_shift);
off &= MMU_LEVEL_MASK;
if (!(cur_lv_tbl[off] & MMU_TYPE_USED))
{
page = get_free_page();
if (!page)
{
return MMU_MAP_ERROR_NOPAGE;
}
rt_memset((char *)page, 0, ARCH_PAGE_SIZE);
cur_lv_tbl[off] = page | MMU_TYPE_TABLE;
}
page = cur_lv_tbl[off];
if ((page & MMU_TYPE_MASK) == MMU_TYPE_BLOCK)
{
/* is block! error! */
return MMU_MAP_ERROR_CONFLICT;
}
cur_lv_tbl = (unsigned long *)(page & MMU_ADDRESS_MASK);
level_shift -= MMU_LEVEL_SHIFT;
}
attr &= MMU_ATTRIB_MASK;
pa |= (attr | MMU_TYPE_BLOCK); /* block */
off = (va >> ARCH_SECTION_SHIFT);
off &= MMU_LEVEL_MASK;
cur_lv_tbl[off] = pa;
return 0;
}
void *rt_ioremap_early(void *paddr, size_t size)
{
size_t count;
static void *tbl = RT_NULL;
if (!size)
{
return RT_NULL;
}
if (!tbl)
{
tbl = rt_hw_mmu_tbl_get();
}
count = (size + ARCH_SECTION_MASK) >> ARCH_SECTION_SHIFT;
while (count --> 0)
{
_map_single_page_2M(tbl, (unsigned long)paddr, (unsigned long)paddr, MMU_MAP_K_DEVICE);
}
return paddr;
}
static int _init_map_2M(unsigned long *lv0_tbl, unsigned long va,
unsigned long pa, unsigned long count,
unsigned long attr)
{
unsigned long i;
int ret;
if (va & ARCH_SECTION_MASK)
{
return -1;
}
if (pa & ARCH_SECTION_MASK)
{
return -1;
}
for (i = 0; i < count; i++)
{
ret = _map_single_page_2M(lv0_tbl, va, pa, attr);
va += ARCH_SECTION_SIZE;
pa += ARCH_SECTION_SIZE;
if (ret != 0)
{
return ret;
}
}
return 0;
}
static unsigned long *_query(rt_aspace_t aspace, void *vaddr, int *plvl_shf)
{
int level;
unsigned long va = (unsigned long)vaddr;
unsigned long *cur_lv_tbl;
unsigned long page;
unsigned long off;
int level_shift = MMU_ADDRESS_BITS;
cur_lv_tbl = aspace->page_table;
RT_ASSERT(cur_lv_tbl);
for (level = 0; level < MMU_TBL_PAGE_4k_LEVEL; level++)
{
off = (va >> level_shift);
off &= MMU_LEVEL_MASK;
if (!(cur_lv_tbl[off] & MMU_TYPE_USED))
{
return (void *)0;
}
page = cur_lv_tbl[off];
if ((page & MMU_TYPE_MASK) == MMU_TYPE_BLOCK)
{
*plvl_shf = level_shift;
return &cur_lv_tbl[off];
}
cur_lv_tbl = (unsigned long *)(page & MMU_ADDRESS_MASK);
cur_lv_tbl = (unsigned long *)((unsigned long)cur_lv_tbl - PV_OFFSET);
level_shift -= MMU_LEVEL_SHIFT;
}
/* now is level MMU_TBL_PAGE_4k_LEVEL */
off = (va >> ARCH_PAGE_SHIFT);
off &= MMU_LEVEL_MASK;
page = cur_lv_tbl[off];
if (!(page & MMU_TYPE_USED))
{
return (void *)0;
}
*plvl_shf = level_shift;
return &cur_lv_tbl[off];
}
void *rt_hw_mmu_v2p(rt_aspace_t aspace, void *v_addr)
{
int level_shift;
unsigned long paddr;
if (aspace == &rt_kernel_space)
{
paddr = (unsigned long)rt_hw_mmu_kernel_v2p(v_addr);
}
else
{
unsigned long *pte = _query(aspace, v_addr, &level_shift);
if (pte)
{
paddr = *pte & MMU_ADDRESS_MASK;
paddr |= (rt_ubase_t)v_addr & ((1ul << level_shift) - 1);
}
else
{
paddr = (unsigned long)ARCH_MAP_FAILED;
}
}
return (void *)paddr;
}
static int _noncache(rt_ubase_t *pte)
{
int err = 0;
const rt_ubase_t idx_shift = 2;
const rt_ubase_t idx_mask = 0x7 << idx_shift;
rt_ubase_t entry = *pte;
if ((entry & idx_mask) == (NORMAL_MEM << idx_shift))
{
*pte = (entry & ~idx_mask) | (NORMAL_NOCACHE_MEM << idx_shift);
}
else
{
// do not support other type to be noncache
err = -RT_ENOSYS;
}
return err;
}
static int _cache(rt_ubase_t *pte)
{
int err = 0;
const rt_ubase_t idx_shift = 2;
const rt_ubase_t idx_mask = 0x7 << idx_shift;
rt_ubase_t entry = *pte;
if ((entry & idx_mask) == (NORMAL_NOCACHE_MEM << idx_shift))
{
*pte = (entry & ~idx_mask) | (NORMAL_MEM << idx_shift);
}
else
{
// do not support other type to be cache
err = -RT_ENOSYS;
}
return err;
}
static int (*control_handler[MMU_CNTL_DUMMY_END])(rt_ubase_t *pte) = {
[MMU_CNTL_CACHE] = _cache,
[MMU_CNTL_NONCACHE] = _noncache,
};
int rt_hw_mmu_control(struct rt_aspace *aspace, void *vaddr, size_t size,
enum rt_mmu_cntl cmd)
{
int level_shift;
int err = -RT_EINVAL;
rt_ubase_t vstart = (rt_ubase_t)vaddr;
rt_ubase_t vend = vstart + size;
int (*handler)(rt_ubase_t * pte);
if (cmd >= 0 && cmd < MMU_CNTL_DUMMY_END)
{
handler = control_handler[cmd];
while (vstart < vend)
{
rt_ubase_t *pte = _query(aspace, (void *)vstart, &level_shift);
rt_ubase_t range_end = vstart + (1ul << level_shift);
RT_ASSERT(range_end <= vend);
if (pte)
{
err = handler(pte);
RT_ASSERT(err == RT_EOK);
}
vstart = range_end;
}
}
else
{
err = -RT_ENOSYS;
}
return err;
}
void rt_hw_mem_setup_early(unsigned long *tbl0, unsigned long *tbl1,
unsigned long size, unsigned long pv_off)
{
int ret;
unsigned long count = (size + ARCH_SECTION_MASK) >> ARCH_SECTION_SHIFT;
unsigned long normal_attr = MMU_MAP_CUSTOM(MMU_AP_KAUN, NORMAL_MEM);
#ifdef RT_USING_SMART
unsigned long va = KERNEL_VADDR_START;
#else
extern unsigned char _start;
unsigned long va = (unsigned long) &_start;
va = RT_ALIGN_DOWN(va, 0x200000);
#endif
/* setup pv off */
rt_kmem_pvoff_set(pv_off);
/* clean the first two pages */
rt_memset((char *)tbl0, 0, ARCH_PAGE_SIZE);
rt_memset((char *)tbl1, 0, ARCH_PAGE_SIZE);
ret = _init_map_2M(tbl1, va, va + pv_off, count, normal_attr);
if (ret != 0)
{
while (1);
}
ret = _init_map_2M(tbl0, va + pv_off, va + pv_off, count, normal_attr);
if (ret != 0)
{
while (1);
}
}
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