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Enable mapping higher physical address 

Current ATF uses a direct physical-to-virtual mapping, that is, a physical
address is mapped to the same address in the virtual space. For example,
physical address 0x8000_0000 is mapped to 0x8000_0000 virtual. This
approach works fine for FVP as all its physical addresses fall into 0 to
4GB range. But for other platform where all I/O addresses are 48-bit long,
If we follow the same direct mapping, we would need virtual address range
from 0 to 0x8fff_ffff_ffff, which is about 144TB. This requires a
significant amount of memory for MMU tables and it is not necessary to use
that much virtual space in ATF.

The patch is to enable mapping a physical address range to an arbitrary
virtual address range (instead of flat mapping)
Changed "base" to "base_va" and added "base_pa" in mmap_region_t and
modified functions such as mmap_add_region and init_xlation_table etc.
Fixes ARM-software/tf-issues#158
This commit is contained in:
Lin Ma 2014-06-02 11:45:36 -07:00
parent e10af77b28
commit f984ce84ba
3 changed files with 63 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/lib/aarch64/xlat_tables.h
View File

@ -55,13 +55,14 @@ typedef enum {
* Structure for specifying a single region of memory.
*/
typedef struct mmap_region {
unsigned long base;
unsigned long base_pa;
unsigned long base_va;
unsigned long size;
mmap_attr_t attr;
} mmap_region_t;
void mmap_add_region(unsigned long base, unsigned long size,
unsigned attr);
void mmap_add_region(unsigned long base_pa, unsigned long base_va,
unsigned long size, unsigned attr);
void mmap_add(const mmap_region_t *mm);
void init_xlat_tables(void);

56
lib/aarch64/xlat_tables.c
View File

@ -72,26 +72,29 @@ static void print_mmap(void)
debug_print("mmap:\n");
mmap_region_t *mm = mmap;
while (mm->size) {
debug_print(" %010lx %10lx %x\n", mm->base, mm->size, mm->attr);
debug_print(" %010lx %010lx %10lx %x\n", mm->base_va,
mm->base_pa, mm->size, mm->attr);
++mm;
};
debug_print("\n");
#endif
}
void mmap_add_region(unsigned long base, unsigned long size, unsigned attr)
void mmap_add_region(unsigned long base_pa, unsigned long base_va,
unsigned long size, unsigned attr)
{
mmap_region_t *mm = mmap;
mmap_region_t *mm_last = mm + sizeof(mmap) / sizeof(mmap[0]) - 1;
assert(IS_PAGE_ALIGNED(base));
assert(IS_PAGE_ALIGNED(base_pa));
assert(IS_PAGE_ALIGNED(base_va));
assert(IS_PAGE_ALIGNED(size));
if (!size)
return;
/* Find correct place in mmap to insert new region */
while (mm->base < base && mm->size)
while (mm->base_va < base_va && mm->size)
++mm;
/* Make room for new region by moving other regions up by one place */
@ -100,7 +103,8 @@ void mmap_add_region(unsigned long base, unsigned long size, unsigned attr)
/* Check we haven't lost the empty sentinal from the end of the array */
assert(mm_last->size == 0);
mm->base = base;
mm->base_pa = base_pa;
mm->base_va = base_va;
mm->size = size;
mm->attr = attr;
}
@ -108,15 +112,15 @@ void mmap_add_region(unsigned long base, unsigned long size, unsigned attr)
void mmap_add(const mmap_region_t *mm)
{
while (mm->size) {
mmap_add_region(mm->base, mm->size, mm->attr);
mmap_add_region(mm->base_pa, mm->base_va, mm->size, mm->attr);
++mm;
}
}
static unsigned long mmap_desc(unsigned attr, unsigned long addr,
static unsigned long mmap_desc(unsigned attr, unsigned long addr_pa,
unsigned level)
{
unsigned long desc = addr;
unsigned long desc = addr_pa;
desc |= level == 3 ? TABLE_DESC : BLOCK_DESC;
@ -142,7 +146,7 @@ static unsigned long mmap_desc(unsigned attr, unsigned long addr,
return desc;
}
static int mmap_region_attr(mmap_region_t *mm, unsigned long base,
static int mmap_region_attr(mmap_region_t *mm, unsigned long base_va,
unsigned long size)
{
int attr = mm->attr;
@ -153,10 +157,10 @@ static int mmap_region_attr(mmap_region_t *mm, unsigned long base,
if (!mm->size)
return attr; /* Reached end of list */
if (mm->base >= base + size)
if (mm->base_va >= base_va + size)
return attr; /* Next region is after area so end */
if (mm->base + mm->size <= base)
if (mm->base_va + mm->size <= base_va)
continue; /* Next region has already been overtaken */
if ((mm->attr & attr) == attr)
@ -164,12 +168,14 @@ static int mmap_region_attr(mmap_region_t *mm, unsigned long base,
attr &= mm->attr;
if (mm->base > base || mm->base + mm->size < base + size)
if (mm->base_va > base_va ||
mm->base_va + mm->size < base_va + size)
return -1; /* Region doesn't fully cover our area */
}
}
static mmap_region_t *init_xlation_table(mmap_region_t *mm, unsigned long base,
static mmap_region_t *init_xlation_table(mmap_region_t *mm,
unsigned long base_va,
unsigned long *table, unsigned level)
{
unsigned level_size_shift = L1_XLAT_ADDRESS_SHIFT - (level - 1) *
@ -184,23 +190,26 @@ static mmap_region_t *init_xlation_table(mmap_region_t *mm, unsigned long base,
do {
unsigned long desc = UNSET_DESC;
if (mm->base + mm->size <= base) {
if (mm->base_va + mm->size <= base_va) {
/* Area now after the region so skip it */
++mm;
continue;
}
debug_print(" %010lx %8lx " + 6 - 2 * level, base, level_size);
debug_print(" %010lx %8lx " + 6 - 2 * level, base_va,
level_size);
if (mm->base >= base + level_size) {
if (mm->base_va >= base_va + level_size) {
/* Next region is after area so nothing to map yet */
desc = INVALID_DESC;
} else if (mm->base <= base &&
mm->base + mm->size >= base + level_size) {
} else if (mm->base_va <= base_va && mm->base_va + mm->size >=
base_va + level_size) {
/* Next region covers all of area */
int attr = mmap_region_attr(mm, base, level_size);
int attr = mmap_region_attr(mm, base_va, level_size);
if (attr >= 0)
desc = mmap_desc(attr, base, level);
desc = mmap_desc(attr,
base_va - mm->base_va + mm->base_pa,
level);
}
/* else Next region only partially covers area, so need */
@ -211,14 +220,15 @@ static mmap_region_t *init_xlation_table(mmap_region_t *mm, unsigned long base,
desc = TABLE_DESC | (unsigned long)new_table;
/* Recurse to fill in new table */
mm = init_xlation_table(mm, base, new_table, level+1);
mm = init_xlation_table(mm, base_va,
new_table, level+1);
}
debug_print("\n");
*table++ = desc;
base += level_size;
} while (mm->size && (base & level_index_mask));
base_va += level_size;
} while (mm->size && (base_va & level_index_mask));
return mm;
}

40
plat/fvp/aarch64/fvp_common.c
View File

@ -54,17 +54,27 @@ static unsigned long fvp_config[CONFIG_LIMIT];
* configure_mmu_elx() will give the available subset of that,
*/
const mmap_region_t fvp_mmap[] = {
{ TZROM_BASE, TZROM_SIZE, MT_MEMORY | MT_RO | MT_SECURE },
{ TZDRAM_BASE, TZDRAM_SIZE, MT_MEMORY | MT_RW | MT_SECURE },
{ FLASH0_BASE, FLASH0_SIZE, MT_MEMORY | MT_RO | MT_SECURE },
{ FLASH1_BASE, FLASH1_SIZE, MT_MEMORY | MT_RO | MT_SECURE },
{ VRAM_BASE, VRAM_SIZE, MT_MEMORY | MT_RW | MT_SECURE },
{ DEVICE0_BASE, DEVICE0_SIZE, MT_DEVICE | MT_RW | MT_SECURE },
{ NSRAM_BASE, NSRAM_SIZE, MT_MEMORY | MT_RW | MT_NS },
{ DEVICE1_BASE, DEVICE1_SIZE, MT_DEVICE | MT_RW | MT_SECURE },
{ TZROM_BASE, TZROM_BASE, TZROM_SIZE,
MT_MEMORY | MT_RO | MT_SECURE },
{ TZDRAM_BASE, TZDRAM_BASE, TZDRAM_SIZE,
MT_MEMORY | MT_RW | MT_SECURE },
{ FLASH0_BASE, FLASH0_BASE, FLASH0_SIZE,
MT_MEMORY | MT_RO | MT_SECURE },
{ FLASH1_BASE, FLASH1_BASE, FLASH1_SIZE,
MT_MEMORY | MT_RO | MT_SECURE },
{ VRAM_BASE, VRAM_BASE, VRAM_SIZE,
MT_MEMORY | MT_RW | MT_SECURE },
{ DEVICE0_BASE, DEVICE0_BASE, DEVICE0_SIZE,
MT_DEVICE | MT_RW | MT_SECURE },
{ NSRAM_BASE, NSRAM_BASE, NSRAM_SIZE,
MT_MEMORY | MT_RW | MT_NS },
{ DEVICE1_BASE, DEVICE1_BASE, DEVICE1_SIZE,
MT_DEVICE | MT_RW | MT_SECURE },
/* 2nd GB as device for now...*/
{ 0x40000000, 0x40000000, MT_DEVICE | MT_RW | MT_SECURE },
{ DRAM1_BASE, DRAM1_SIZE, MT_MEMORY | MT_RW | MT_NS },
{ 0x40000000, 0x40000000, 0x40000000,
MT_DEVICE | MT_RW | MT_SECURE },
{ DRAM1_BASE, DRAM1_BASE, DRAM1_SIZE,
MT_MEMORY | MT_RW | MT_NS },
{0}
};
@ -73,19 +83,21 @@ const mmap_region_t fvp_mmap[] = {
* the platform memory map & initialize the mmu, for the given exception level
******************************************************************************/
#define DEFINE_CONFIGURE_MMU_EL(_el) \
void fvp_configure_mmu_el##_el(unsigned long total_base, \
void fvp_configure_mmu_el##_el(unsigned long total_base, \
unsigned long total_size, \
unsigned long ro_start, \
unsigned long ro_limit, \
unsigned long coh_start, \
unsigned long coh_limit) \
{ \
mmap_add_region(total_base, \
mmap_add_region(total_base, total_base, \
total_size, \
MT_MEMORY | MT_RW | MT_SECURE); \
mmap_add_region(ro_start, ro_limit - ro_start, \
mmap_add_region(ro_start, ro_start, \
ro_limit - ro_start, \
MT_MEMORY | MT_RO | MT_SECURE); \
mmap_add_region(coh_start, coh_limit - coh_start, \
mmap_add_region(coh_start, coh_start, \
coh_limit - coh_start, \
MT_DEVICE | MT_RW | MT_SECURE); \
mmap_add(fvp_mmap); \
init_xlat_tables(); \