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VGA tty initialization should not run outside of bare metal mode (#614)

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tkchia 2022-09-14 06:27:19 +08:00 committed by GitHub
parent 945699694e
commit 6a3330d7c9
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1 changed files with 23 additions and 20 deletions
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43
libc/vga/writev-vga.c
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@ -27,6 +27,7 @@
#include "libc/calls/struct/fd.internal.h"
#include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h"
#include "libc/dce.h"
#include "libc/vga/vga.internal.h"
#include "libc/runtime/pc.internal.h"
#include "libc/str/str.h"
@ -58,24 +59,26 @@ ssize_t sys_writev_vga(struct Fd *fd, const struct iovec *iov, int iovlen) {
}
__attribute__((__constructor__)) static textstartup void _vga_init(void) {
void * const vid_buf = (void *)(BANE + 0xb8000ull);
/*
* Get the initial cursor position from the BIOS data area. Also get
* the height (in scan lines) of each character; this is used to set the
* cursor shape.
*/
typedef struct {
unsigned char col, row;
} bios_curs_pos_t;
bios_curs_pos_t pos = *(bios_curs_pos_t *)(BANE + 0x0450ull);
uint8_t chr_ht = *(uint8_t *)(BANE + 0x0485ull),
chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull);
if (chr_ht_hi != 0 || chr_ht > 32)
chr_ht = 32;
/*
* Initialize our tty structure from the current screen contents, current
* cursor position, & character height.
*/
_StartTty(&_vga_tty, VGA_TTY_HEIGHT, VGA_TTY_WIDTH, pos.row, pos.col,
chr_ht, vid_buf, vga_wcs);
if (IsMetal()) {
void * const vid_buf = (void *)(BANE + 0xb8000ull);
/*
* Get the initial cursor position from the BIOS data area. Also get
* the height (in scan lines) of each character; this is used to set the
* cursor shape.
*/
typedef struct {
unsigned char col, row;
} bios_curs_pos_t;
bios_curs_pos_t pos = *(bios_curs_pos_t *)(BANE + 0x0450ull);
uint8_t chr_ht = *(uint8_t *)(BANE + 0x0485ull),
chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull);
if (chr_ht_hi != 0 || chr_ht > 32)
chr_ht = 32;
/*
* Initialize our tty structure from the current screen contents,
* current cursor position, & character height.
*/
_StartTty(&_vga_tty, VGA_TTY_HEIGHT, VGA_TTY_WIDTH, pos.row, pos.col,
chr_ht, vid_buf, vga_wcs);
}
}