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fix: memory: protect kernel code

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Starnakin
2024-11-26 12:43:09 +01:00
parent 0c280d971b
commit da804296c6
4 changed files with 63 additions and 35 deletions
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26
headers/memory.h
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@ -5,18 +5,20 @@
#include <stddef.h>
#include <stdint.h>
#define PRESENT (1 << 0)
#define RW (1 << 1)
#define SUPERVISOR (0 << 2)
#define ACCESSED (1 << 4)
#define INIT_FLAGS (PRESENT | RW | SUPERVISOR)
#define PAGE_SIZE 4096
#define PT_SIZE 1024
#define PD_SIZE 1024
#define PAGE_MASK 0xFFFFF000
#define HEAP_END 0xC0000000
#define HEAP_START ((uint32_t) & _kernel_end - HEAP_END)
#define PT_START 256
#define PRESENT (1 << 0)
#define RW (1 << 1)
#define SUPERVISOR (0 << 2)
#define ACCESSED (1 << 4)
#define INIT_FLAGS (PRESENT | RW | SUPERVISOR)
#define PAGE_SIZE 4096
#define PT_SIZE 1024
#define PD_SIZE 1024
#define PAGE_MASK 0xFFFFF000
#define HEAP_END 0xC0000000
#define HEAP_START ((uint32_t) & _kernel_end - HEAP_END)
#define KERNEL_START ((uint32_t) & _kernel_start)
#define KERNEL_END ((uint32_t) & _kernel_end - HEAP_END)
#define PT_START 256
#define GET_PAGE_ADDR(pd_index, pt_index) \
((((uint32_t)pd_index * 1024) + (uint32_t)pt_index) * 4096)