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armv8: mmu: add a way to map additional regions

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In some cases we might want to map some memory region after enabling
caches. Introduce a new helper for this.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>
This commit is contained in:
Caleb Connolly 2024-08-09 01:59:31 +02:00
parent a9337c6651
commit 9f2d456146
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GPG key ID: 7930459FB9303217
2 changed files with 35 additions and 0 deletions
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25
arch/arm/cpu/armv8/cache_v8.c
View file

@ -339,6 +339,31 @@ static void map_range(u64 virt, u64 phys, u64 size, int level,
}
}
void mmu_map_region(phys_addr_t addr, u64 size, bool emergency)
{
u64 va_bits;
int level = 0;
u64 attrs = PTE_BLOCK_MEMTYPE(MT_NORMAL) | PTE_BLOCK_INNER_SHARE;
attrs |= PTE_TYPE_BLOCK | PTE_BLOCK_AF;
get_tcr(NULL, &va_bits);
if (va_bits < 39)
level = 1;
if (emergency)
map_range(addr, addr, size, level,
(u64 *)gd->arch.tlb_emerg, attrs);
/* Switch pagetables while we update the primary one */
__asm_switch_ttbr(gd->arch.tlb_emerg);
map_range(addr, addr, size, level,
(u64 *)gd->arch.tlb_addr, attrs);
__asm_switch_ttbr(gd->arch.tlb_addr);
}
static void add_map(struct mm_region *map)
{
u64 attrs = map->attrs | PTE_TYPE_BLOCK | PTE_BLOCK_AF;

10
arch/arm/include/asm/system.h
View file

@ -277,6 +277,16 @@ void protect_secure_region(void);
void smp_kick_all_cpus(void);
void flush_l3_cache(void);
/**
* mmu_map_region() - map a region of previously unmapped memory.
* Will be mapped MT_NORMAL & PTE_BLOCK_INNER_SHARE.
*
* @start: Start address of the region
* @size: Size of the region
* @emerg: Also map the region in the emergency table
*/
void mmu_map_region(phys_addr_t start, u64 size, bool emerg);
void mmu_change_region_attr(phys_addr_t start, size_t size, u64 attrs);
/*