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author | Sascha Hauer <s.hauer@pengutronix.de> | 2023-05-10 14:04:47 +0200 |
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committer | Sascha Hauer <s.hauer@pengutronix.de> | 2023-05-22 12:38:17 +0200 |
commit | 2a16178a537ff6c25989c56a6ae3ddaa97ee6ce6 (patch) | |
tree | 10464c75a3ae59fa75150ba5dbf94f66adabded9 /arch/arm/cpu/mmu_64.c | |
parent | 29aff371086a39b42adc374a49b6ca1f002ae06e (diff) | |
download | barebox-2a16178a537ff6c25989c56a6ae3ddaa97ee6ce6.tar.gz barebox-2a16178a537ff6c25989c56a6ae3ddaa97ee6ce6.tar.xz |
ARM: mmu64: create alloc_pte()
This is a preparation for using two level page tables in the PBL.
To do that we need a way to allocate page tables in PBL. As malloc
is not available in PBL, implement a function to allocate a page table
from the area we also place the TTB.
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/cpu/mmu_64.c')
-rw-r--r-- | arch/arm/cpu/mmu_64.c | 20 |
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/arm/cpu/mmu_64.c b/arch/arm/cpu/mmu_64.c index 55ada960c5..3cc5b14a46 100644 --- a/arch/arm/cpu/mmu_64.c +++ b/arch/arm/cpu/mmu_64.c @@ -32,7 +32,20 @@ static void set_table(uint64_t *pt, uint64_t *table_addr) *pt = val; } -static uint64_t *create_table(void) +#ifdef __PBL__ +static uint64_t *alloc_pte(void) +{ + static unsigned int idx; + + idx++; + + if (idx * GRANULE_SIZE >= ARM_EARLY_PAGETABLE_SIZE) + return NULL; + + return (void *)ttb + idx * GRANULE_SIZE; +} +#else +static uint64_t *alloc_pte(void) { uint64_t *new_table = xmemalign(GRANULE_SIZE, GRANULE_SIZE); @@ -41,6 +54,7 @@ static uint64_t *create_table(void) return new_table; } +#endif static __maybe_unused uint64_t *find_pte(uint64_t addr) { @@ -81,7 +95,7 @@ static void split_block(uint64_t *pte, int level) /* level describes the parent level, we need the child ones */ levelshift = level2shift(level + 1); - new_table = create_table(); + new_table = alloc_pte(); for (i = 0; i < MAX_PTE_ENTRIES; i++) { new_table[i] = old_pte | (i << levelshift); @@ -183,7 +197,7 @@ void __mmu_init(bool mmu_on) if (mmu_on) mmu_disable(); - ttb = create_table(); + ttb = alloc_pte(); el = current_el(); set_ttbr_tcr_mair(el, (uint64_t)ttb, calc_tcr(el, BITS_PER_VA), MEMORY_ATTRIBUTES); |