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| author | Danny Holman <dholman@gymli.org> | 2023-11-26 18:17:39 -0600 |
|---|---|---|
| committer | Danny Holman <dholman@gymli.org> | 2023-11-26 18:17:39 -0600 |
| commit | f63f92582552af06d8ad7bc4ccd235e51ad651b7 (patch) | |
| tree | 17e1f74dcea6321e66237913c4af64dddd03c5cd /arch/i386 | |
| parent | b3afa2373aeb7ff119dcd8a2c0bea4114799604a (diff) | |
arch: i386: boot.s: define functions for page management
Define the load_page_dir and enable_paging functions in assembly. This
allows normal C code to initialize the CR3 register and control paging
without using inline assembler.
Signed-off-by: Danny Holman <dholman@gymli.org>
Diffstat (limited to 'arch/i386')
| -rw-r--r-- | arch/i386/boot/boot.s | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/i386/boot/boot.s b/arch/i386/boot/boot.s index 4a6ddd1..48f9f29 100644 --- a/arch/i386/boot/boot.s +++ b/arch/i386/boot/boot.s @@ -76,6 +76,33 @@ _start: 1: hlt jmp 1b +.global load_page_dir +.type load_page_dir, @function +load_page_dir: + pushl %ebp + movl %esp, %ebp + + movl 8(%ebp), %eax + movl %eax, %cr3 + + movl %ebp, %esp + popl %ebp + ret + +.global enable_paging +.type enable_paging, @function +enable_paging: + pushl %ebp + movl %esp, %ebp + + movl %cr0, %eax + orl $0x80000001, %eax + movl %eax, %cr0 + + movl %ebp, %esp + popl %ebp + ret + .global flush_gdt .type flush_gdt, @function flush_gdt: |