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x86_64 acpi: map rsdp

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Matheus
2023-08-06 00:44:52 -03:00
parent 30851d4971
commit 25828c17c6
1 changed files with 11 additions and 0 deletions
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kernel-src/arch/x86-64/acpi.c
+11
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@@ -2,6 +2,7 @@
#include <limine.h>
#include <logging.h>
#include <kernel/alloc.h>
#include <kernel/vmm.h>
#include <kernel/pmm.h>
#include <string.h>
@@ -40,6 +41,16 @@ void arch_acpi_init() {
// FIXME search if no response
__assert(rsdpreq.response);
rsdp_t *rsdp = rsdpreq.response->address;
uintmax_t pageoffset = (uintptr_t)rsdp % PAGE_SIZE;
// map rsdp
// make sure it doesn't cross a page boundary
// TODO support this
__assert(ROUND_DOWN((uintptr_t)rsdp, PAGE_SIZE) == ROUND_DOWN((uintptr_t)rsdp - 1 + sizeof(rsdp_t), PAGE_SIZE));
void *virt = vmm_map(NULL, sizeof(rsdp_t), VMM_FLAGS_PHYSICAL, ARCH_MMU_FLAGS_READ | ARCH_MMU_FLAGS_NOEXEC, FROM_HHDM(rsdp));
__assert(virt);
rsdp = (rsdp_t *)((uintptr_t)virt + pageoffset);
if (rsdp->revision == 0) {
printf("\e[93mACPI version 1.0 -- Using RSDT instead of XSDT.\e[0m\n");