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Implemented paging

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Tom-on
2025-03-29 12:06:56 +01:00
parent 9d931f9e9d
commit dd7e621640
5 changed files with 235 additions and 13 deletions
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kernel/include/kernel.h
+11
View File
@@ -4,6 +4,17 @@
// Null definition
#define NULL ((void*)0)
/*
* Virtual memory addresses
*/
#define USER_HEAP 0x10000000
#define USER_STACK 0xBF000000
#define USER_SHARED 0xA0000000
#define KERNEL_BASE 0xC0000000
#define KERNEL_HEAP 0xD0000000
#define KERNEL_SHARED 0xF0000000
#define KERNEL_FRAMEBUF 0xC8000000
/*
* Variable arguments
*/
kernel/include/paging.h
+20 -6
View File
@@ -3,9 +3,13 @@
#include <kernel.h>
#define PAGE_SIZE 4096
#define PHYS_ADDR(_a) ((_a) & ~0xFFF)
#define PHYS_ADDR(_a) ((_a) & ~0xfff)
// The kernels pagedir
#define PAGEDIR ((uint32_t*)(0xFFFFF000))
#define PAGETAB(_i) ((uint32_t*)(0xFFC00000 + ((_i) << 12)))
#define PAGE_SIZE 4096
#define PAGE_FLAG_PRESENT (1 << 0)
#define PAGE_FLAG_WRITE (1 << 1)
@@ -13,13 +17,23 @@
#define PAGE_FLAG_PWT (1 << 3)
#define PAGE_FLAG_NOCACHE (1 << 4)
#define PAGE_FLAG_ACCESSED (1 << 5)
#define PAGE_FLAG_DIRTY (1 << 6)
#define PAGE_FLAG_4MB (1 << 7)
#define PAGE_FLAG_DIRTY (1 << 6) // AVL in PDE where PS = 0
#define PAGE_FLAG_PS (1 << 7) // If PS = 1 then directly maps a 4MB page
#define PAGE_FLAG_GLOBAL (1 << 8)
// bits 9-11 are AVL - OS is free to use these as its own flags
#define PAGE_FLAG_OWNER (1 << 9)
// Defined in entry.s for initial paging
extern uint32_t init_pagedir[1024];
extern uint32_t init_pagedir[1024]; // Defined in entry.s for initial paging
extern size_t pag_pageCount;
int pag_init(void);
void pag_mapPage(uint32_t vaddr, uint32_t paddr, uint32_t flags);
uint32_t pag_umapPage(uint32_t vaddr);
void* pag_virtToPhys(uint32_t vaddr);
uint32_t* pag_getPagedir();
void pag_setPagedir(uint32_t* pagedir);
void pag_syncPagedir();
uint32_t* pag_allocPagedir();
void pag_freePagedir(uint32_t* pagedir);
#endif