mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-06-30 08:18:30 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

[metal] Fix video mode filtering & frame buffer ref-counting (#889)

Browse source 
Co-authored-by: tkchia <tkchia-cosmo@gmx.com>
This commit is contained in:
tkchia 2023-09-06 18:41:07 +08:00 • committed by GitHub
parent 0d748ad58e
commit b21842ed7a
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
3 changed files with 20 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

15
libc/runtime/pc.internal.h
View file

@ -159,6 +159,7 @@
#define PAGE_V /* */ 0b000000000001
#define PAGE_RW /* */ 0b000000000010
#define PAGE_U /* */ 0b000000000100
#define PAGE_PCD /* */ 0b000000010000
#define PAGE_PS /* */ 0b000010000000
#define PAGE_G /* */ 0b000100000000
#define PAGE_IGN1 /* */ 0b111000000000
@ -196,6 +197,20 @@ void __ref_page(struct mman *, uint64_t *, uint64_t);
void __ref_pages(struct mman *, uint64_t *, uint64_t, uint64_t);
void __unref_page(struct mman *, uint64_t *, uint64_t);
/**
* Identity maps an area of physical memory to its negative address and
* marks it as permanently referenced and unreclaimable (so that it will
* never be added to the free list). This is useful for special-purpose
* physical memory regions, such as video frame buffers and memory-mapped
* I/O devices.
*/
forceinline void __invert_and_perm_ref_memory_area(struct mman *mm,
uint64_t *pml4t, uint64_t ps,
uint64_t size,
uint64_t pte_flags) {
__invert_memory_area(mm, pml4t, ps, size, pte_flags | PAGE_REFC);
}
forceinline unsigned char inb(unsigned short port) {
unsigned char al;
asm volatile("inb\t%1,%0" : "=a"(al) : "dN"(port));