gbowne1/ClassicOS
2
2
Fork 0
mirror of https://github.com/gbowne1/ClassicOS.git synced 2026-01-15 10:35:20 -08:00
Code Issues 2 Packages Projects 1 Releases Wiki Activity

Fix PDE/PTE definitions, header cleanup

Browse Source 
- Fixes PDE/PTE definitions in kernel/paging.h
- removes memset declaration from kernel/utils.h, uses klibc string.h as
needed
This commit is contained in:
vmttmv
2026-01-12 03:48:02 +02:00
parent 86608ef48c
commit 3b67e81ed0
4 changed files with 34 additions and 58 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
kernel/paging.h
View File

@@ -10,31 +10,31 @@
// Page Directory and Page Table structure
typedef struct {
uint32_t present : 1; // Present bit (1: page is present in memory)
uint32_t rw : 1; // Read-Write bit (1: page is read-write)
uint32_t user : 1; // User-supervisor bit (1: user mode access)
uint32_t write_through : 1; // Write-through cache
uint32_t cache_disabled : 1; // Cache disabled
uint32_t accessed : 1; // Accessed bit
uint32_t reserved : 1; // Reserved bit
uint32_t page_size : 1; // Page size (0: 4KB, 1: 4MB)
uint32_t global : 1; // Global page (can be used across different processes)
uint32_t available : 3; // Available bits for the system
uint32_t frame : 20; // Frame address (physical address)
uint32_t present : 1; // Present bit (1: page is present in memory)
uint32_t rw : 1; // Read-Write bit (1: page is read-write)
uint32_t user : 1; // User-supervisor bit (1: user mode access)
uint32_t write_through : 1; // Write-through cache
uint32_t cache_disabled : 1; // Cache disabled
uint32_t accessed : 1; // Accessed bit
uint32_t dirty : 1; // Dirty bit
uint32_t attribute : 1; // Page size (0: 4KB, 1: 4MB)
uint32_t global : 1; // Global page (can be used across different processes)
uint32_t reserved : 3; // Unused
uint32_t addr : 20; // Page frame address (physical address)
} __attribute__((packed)) page_table_entry_t;
// Define page directory entry
typedef struct {
uint32_t present : 1;
uint32_t rw : 1;
uint32_t user : 1;
uint32_t write_through : 1;
uint32_t cache_disabled : 1;
uint32_t accessed : 1;
uint32_t reserved : 1;
uint32_t zero : 5; // Must be zero for page directory
uint32_t reserved_2 : 7; // Reserved bits
uint32_t frame : 20; // Frame address of the page table
uint32_t present : 1; // Present bit (1: PTE is present in memory)
uint32_t rw : 1; // Read-Write bit (1: pages are read-write)
uint32_t user : 1; // User-supervisor bit (1: user mode access)
uint32_t write_through : 1; // Write-through cache
uint32_t cache_disabled : 1; // Cache disabled
uint32_t accessed : 1; // Accessed bit
uint32_t available : 1; // Unused
uint32_t page_size : 1; // Page size (0: 4KB, 1: 4MB)
uint32_t available_2 : 4; // Unused
uint32_t addr : 20; // Page table address
} __attribute__((packed)) page_directory_entry_t;
extern page_directory_entry_t *page_directory;