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memory: Map lowmem using 16K pages only

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Turns out CTRR does not like working with huge pages, and just throws up
its hands in the air with an L2 address size fault if a huge page
overlaps the CTRR region.

Signed-off-by: Asahi Lina <lina@asahilina.net>
This commit is contained in:
Asahi Lina 2022-08-26 18:41:38 +09:00
parent 6feceef2b0
commit da9ceddeac
1 changed files with 9 additions and 3 deletions
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12
src/memory.c
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@ -260,7 +260,13 @@ int mmu_map(u64 from, u64 to, u64 size)
return -1;
// L3 mappings to boundary
chunk = min(size, ALIGN_UP(from, MASK(VADDR_L2_OFFSET_BITS)) - from);
u64 boundary = ALIGN_UP(from, MASK(VADDR_L2_OFFSET_BITS));
// CPU CTRR doesn't like L2 mappings crossing CTRR boundaries!
// Map everything below the m1n1 base as L3
if (boundary >= ram_base && boundary < (u64)_base)
boundary = ALIGN_UP((u64)_base, MASK(VADDR_L2_OFFSET_BITS));
chunk = min(size, boundary - from);
if (chunk) {
mmu_pt_map_l3(from, to, chunk);
from += chunk;
@ -391,8 +397,6 @@ void mmu_map_framebuffer(u64 addr, size_t size)
static void mmu_add_default_mappings(void)
{
mmu_map_mmio();
ram_base = ALIGN_DOWN(cur_boot_args.phys_base, BIT(32));
uint64_t ram_size = cur_boot_args.mem_size + cur_boot_args.phys_base - ram_base;
ram_size = ALIGN_DOWN(ram_size, 0x4000);
@ -400,6 +404,8 @@ static void mmu_add_default_mappings(void)
printf("MMU: RAM base: 0x%lx\n", ram_base);
printf("MMU: Top of normal RAM: 0x%lx\n", ram_base + ram_size);
mmu_map_mmio();
/*
* Create identity mapping for RAM from 0x08_0000_0000
* With SPRR enabled, this becomes RW.