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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/fd.internal.h"
#include "libc/calls/struct/iovec.h" #include "libc/calls/struct/iovec.h"
#include "libc/calls/struct/iovec.internal.h" #include "libc/calls/struct/iovec.internal.h"
#include "libc/dce.h"
#include "libc/vga/vga.internal.h" #include "libc/vga/vga.internal.h"
#include "libc/runtime/pc.internal.h" #include "libc/runtime/pc.internal.h"
#include "libc/str/str.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) { __attribute__((__constructor__)) static textstartup void _vga_init(void) {
void * const vid_buf = (void *)(BANE + 0xb8000ull); 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 * Get the initial cursor position from the BIOS data area. Also get
* cursor shape. * the height (in scan lines) of each character; this is used to set the
*/ * cursor shape.
typedef struct { */
unsigned char col, row; typedef struct {
} bios_curs_pos_t; unsigned char col, row;
bios_curs_pos_t pos = *(bios_curs_pos_t *)(BANE + 0x0450ull); } bios_curs_pos_t;
uint8_t chr_ht = *(uint8_t *)(BANE + 0x0485ull), bios_curs_pos_t pos = *(bios_curs_pos_t *)(BANE + 0x0450ull);
chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull); uint8_t chr_ht = *(uint8_t *)(BANE + 0x0485ull),
if (chr_ht_hi != 0 || chr_ht > 32) chr_ht_hi = *(uint8_t *)(BANE + 0x0486ull);
chr_ht = 32; 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. * 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); _StartTty(&_vga_tty, VGA_TTY_HEIGHT, VGA_TTY_WIDTH, pos.row, pos.col,
chr_ht, vid_buf, vga_wcs);
}
} }