EMK/emk
1
0
Fork 0
Code Issues Activity

fix/kernel: Fixed LAPIC r/w

Browse source
This commit is contained in:
Kevin Alavik 2025-06-01 11:56:18 +02:00
parent 3892fc04c4
commit 03cc8ff8de
Signed by: cmpsb
GPG key ID: 10D1CC0526FDC6D7
2 changed files with 21 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

3
kernel/src/arch/paging.c
View file

@ -232,6 +232,9 @@ void paging_init(void)
}
memset(kernel_pagemap, 0, PAGE_SIZE);
if (_supports_large_pages())
log_early("Support for 2MB pages is present");
/* Map kernel stack */
uint64_t stack_top = ALIGN_UP(kstack_top, PAGE_SIZE);
for (uint64_t addr = stack_top - (16 * 1024); addr < stack_top; addr += PAGE_SIZE)

19
kernel/src/sys/apic/lapic.c
View file

@ -6,6 +6,9 @@
#include <stdatomic.h>
#include <sys/kpanic.h>
#define LAPIC_REG_ALIGN 16
#define LAPIC_REG_SIZE 4
atomic_uintptr_t lapic_msr = 0;
atomic_uintptr_t lapic_base_atomic = 0;
@ -19,7 +22,13 @@ void lapic_write(uint32_t offset, uint32_t value)
log_early("error: LAPIC not initialized!");
kpanic(NULL, "LAPIC write attempted before initialization");
}
base[offset / 4] = value;
if (offset % LAPIC_REG_ALIGN != 0)
{
log_early("error: Misaligned LAPIC offset 0x%x", offset);
kpanic(NULL, "Invalid LAPIC register offset");
}
volatile uint32_t *reg = base + (offset / LAPIC_REG_SIZE);
*reg = value;
}
uint32_t lapic_read(uint32_t offset)
@ -30,7 +39,13 @@ uint32_t lapic_read(uint32_t offset)
log_early("error: LAPIC not initialized!");
return 0;
}
return base[offset / 4];
if (offset % LAPIC_REG_ALIGN != 0)
{
log_early("error: Misaligned LAPIC offset 0x%x", offset);
kpanic(NULL, "Invalid LAPIC register offset");
}
volatile uint32_t *reg = base + (offset / LAPIC_REG_SIZE);
return *reg;
}
void lapic_init(void)