wip: change the C function set_mem_size to asm

This commit is contained in:
0x35c 2024-11-08 12:45:00 +01:00
parent 5fccbf3708
commit 3c87632b0c
5 changed files with 38 additions and 8 deletions

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@ -23,7 +23,7 @@ extern uint32_t _kernel_end;
extern uint32_t boot_page_directory; extern uint32_t boot_page_directory;
extern uint32_t *page_directory; extern uint32_t *page_directory;
extern uint32_t page_table_default[1024]; extern uint32_t page_table_default[1024];
extern uint32_t mem_size; extern uint64_t mem_size;
uint32_t *virt_to_phys(uint32_t *virt_addr); uint32_t *virt_to_phys(uint32_t *virt_addr);
void init_memory(void); void init_memory(void);

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@ -34,6 +34,7 @@ boot_page_table1:
# The kernel entry point. # The kernel entry point.
.section .multiboot.text, "a" .section .multiboot.text, "a"
.global _start .global _start
.global end_mem
.type _start, @function .type _start, @function
_start: _start:
# Physical address of boot_page_table1. # Physical address of boot_page_table1.
@ -89,6 +90,10 @@ _start:
movl $(boot_page_directory - 0xC0000000), %ecx movl $(boot_page_directory - 0xC0000000), %ecx
movl %ecx, %cr3 movl %ecx, %cr3
jmp set_mem_size
end_mem:
# Enable paging and the write-protect bit. # Enable paging and the write-protect bit.
movl %cr0, %ecx movl %cr0, %ecx
orl $0x80000000, %ecx orl $0x80000000, %ecx
@ -113,9 +118,6 @@ _start:
# Set up the stack. # Set up the stack.
mov $stack_top, %esp mov $stack_top, %esp
push %eax
push %ebx
# Enter the high-level kernel. # Enter the high-level kernel.
call kernel_main call kernel_main

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@ -31,7 +31,8 @@
* feeling qui me donnerait envie de continuer dans une relation "couple" sur le * feeling qui me donnerait envie de continuer dans une relation "couple" sur le
* long terme. Je sais pas trop comment le dire sans que ça te blesse, c'est pas * long terme. Je sais pas trop comment le dire sans que ça te blesse, c'est pas
* personnel ou quoi c'est cool quand on parle et tout mais juste je ne pense * personnel ou quoi c'est cool quand on parle et tout mais juste je ne pense
* pas pouvoir faire marcher une relation comme celle :( */ /* Voilà je voulais juste te le dire pour pas que tu te mettes quelque chose en * pas pouvoir faire marcher une relation comme celle :( */
/* Voilà je voulais juste te le dire pour pas que tu te mettes quelque chose en
* tête qui n'arrivera pas, je trouve ça plus correct */ * tête qui n'arrivera pas, je trouve ça plus correct */
static void set_mem_size(multiboot_info_t *mbd, uint32_t magic) static void set_mem_size(multiboot_info_t *mbd, uint32_t magic)
@ -54,14 +55,14 @@ static void set_mem_size(multiboot_info_t *mbd, uint32_t magic)
} }
} }
void kernel_main(multiboot_info_t *mbd, uint32_t magic) void kernel_main(void)
{ {
terminal_initialize(); terminal_initialize();
init_gdt(); init_gdt();
init_idt(); init_idt();
init_memory(); init_memory();
load_drivers(); load_drivers();
set_mem_size(mbd, magic); /* set_mem_size(mbd, magic); */
kprintf(KERN_ALERT kprintf(KERN_ALERT
"I see no way to confuse an array of 256 seg:off pairs with a " "I see no way to confuse an array of 256 seg:off pairs with a "
"complex 8*unknown quantity -byte descriptor table. -- Troy " "complex 8*unknown quantity -byte descriptor table. -- Troy "

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@ -6,7 +6,7 @@
uint32_t *page_directory = &boot_page_directory; uint32_t *page_directory = &boot_page_directory;
uint32_t page_table_default[1024] __attribute__((aligned(4096))); uint32_t page_table_default[1024] __attribute__((aligned(4096)));
uint32_t mem_size; uint64_t mem_size;
void init_memory(void) void init_memory(void)
{ {

27
src/set_mem_size.s Normal file
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@ -0,0 +1,27 @@
.intel_syntax noprefix
.section .text
.global set_mem_size
set_mem_size:
xor ebx, ebx
.L1:
// loop condition
cmp ebx, [eax + 64]
jge end_mem
// declare mmmt
mov ecx, [eax + 68]
add ecx, ebx
// check if the mmmt->type is available (1)
cmp DWORD PTR [ecx + 20], 1
jne .L2
// add the size of the block
mov edx, [ecx + 12]
add DWORD PTR mem_size, edx
mov edx, [ecx + 16]
add DWORD PTR mem_size + 4, edx
.L2:
add ebx, 24
jmp .L1