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smp: Co-opt Multiboot's config_table member to sneak ACPI tables to kernel

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This commit is contained in:
K. Lange 2021-09-06 19:46:36 +09:00
parent ab19318b27
commit 8a944f4a83
1 changed files with 13 additions and 4 deletions
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17
kernel/arch/x86_64/smp.c
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@ -10,6 +10,7 @@
#include <kernel/printf.h>
#include <kernel/misc.h>
#include <kernel/args.h>
#include <kernel/multiboot.h>
#include <kernel/arch/x86_64/acpi.h>
#include <kernel/arch/x86_64/mmu.h>
@ -186,9 +187,17 @@ void lapic_send_ipi(int i, uint32_t val) {
void smp_initialize(void) {
/* Locate ACPI tables */
uintptr_t scan;
uintptr_t scan = 0xE0000;
uintptr_t scan_top = 0x100000;
int good = 0;
for (scan = 0x000E0000; scan < 0x00100000; scan += 16) {
extern struct multiboot * mboot_struct;
if (mboot_struct->config_table) {
scan = mboot_struct->config_table;
scan_top = scan + 0x100000;
}
for (; scan < scan_top; scan += 16) {
char * _scan = mmu_map_from_physical(scan);
if (_scan[0] == 'R' &&
_scan[1] == 'S' &&
@ -209,10 +218,10 @@ void smp_initialize(void) {
return;
}
struct rsdp_descriptor * rsdp = (struct rsdp_descriptor *)scan;
struct rsdp_descriptor * rsdp = (struct rsdp_descriptor *)mmu_map_from_physical(scan);
uint8_t check = 0;
uint8_t * tmp;
for (tmp = (uint8_t *)scan; (uintptr_t)tmp < scan + sizeof(struct rsdp_descriptor); tmp++) {
for (tmp = (uint8_t *)rsdp; (uintptr_t)tmp < (uintptr_t)rsdp + sizeof(struct rsdp_descriptor); tmp++) {
check += *tmp;
}
if (check != 0 && !args_present("noacpichecksum")) {