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d3efa47f81
* [metal] Refactoring: separate out sys_writev_vga() and _vga_init() modules * [metal] Read VGA info from BDA before long mode entry, not after If using a pre-existing VGA text console, the VGA initialization code now retrieves the cursor position & character height from the BIOS data area while still in real mode — rather than reading from the BIOS data area only after entering long mode. (This should help make the code more correct, if Cosmopolitan were to support UEFI graphics output in the future. If the program were booted via UEFI, then the long mode IsMetal() code would still be activated, but the BIOS data area might not have been initialized in that case.) This change also means that there are now a few more fields in the `struct mman`. * [metal] VGA console can now show "screen of death" upon a crash There is now a new function _klog_vga(), which can be called by kprintf() to output system messages — e.g. information about CPU exceptions — on the VGA screen. * [metal] CPU exception handler now dumps cr2 value * [metal] Add demo of program crash reporting w/ bare metal VGA TTY * [metal] Reduce size of "screen of death" code
50 lines
2.3 KiB
C
50 lines
2.3 KiB
C
#ifndef COSMOPOLITAN_LIBC_RUNTIME_MMAN_H_
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#define COSMOPOLITAN_LIBC_RUNTIME_MMAN_H_
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#include "libc/runtime/e820.internal.h"
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#if !(__ASSEMBLER__ + __LINKER__ + 0)
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COSMOPOLITAN_C_START_
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struct mman {
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int64_t pdp; /* 0x0500 */
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int32_t pdpi; /* 0x0508 */
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int32_t e820n; /* 0x050c */
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struct SmapEntry e820[256]; /* 0x0510 */
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struct SmapEntry e820_end[0]; /* 0x1d10 */
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char pc_drive_base_table[11]; /* 0x1d10 */
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unsigned char pc_drive_type; /* 0x1d1b */
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unsigned char pc_drive_last_sector; /* 0x1d1c */
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unsigned short pc_drive_last_cylinder; /* 0x1d1e */
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unsigned char pc_drives_attached; /* 0x1d20 */
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unsigned char pc_drive_last_head; /* 0x1d21 */
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unsigned char pc_drive; /* 0x1d22 */
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char bad_idt[6]; /* 0x1d23 */
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unsigned char pc_video_type; /* 0x1d29 */
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unsigned short pc_video_stride; /* 0x1d2a — line width, including any
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invisible "pixels" — in
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bytes (NOTE) */
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unsigned short pc_video_width; /* 0x1d2c — width in chars. (text)
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or pixels (graphics) */
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unsigned short pc_video_height; /* 0x1d2e — height in chars. (text)
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or pixels (graphics) */
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uint64_t pc_video_framebuffer; /* 0x1d30 — physical address of
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video frame buffer */
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uint64_t pc_video_framebuffer_size; /* 0x1d38 */
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struct { /* 0x1d40 — starting cursor pos. */
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unsigned short y, x;
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} pc_video_curs_info;
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unsigned short pc_video_char_height; /* 0x1d44 — character height (useful
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for setting cursor shape
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in text mode) */
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};
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COSMOPOLITAN_C_END_
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#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
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/* Values for mman::pc_video_type. TODO: implement graphics modes. */
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#define PC_VIDEO_TEXT 0
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#define PC_VIDEO_BGR565 1
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#define PC_VIDEO_BGR555 2
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#define PC_VIDEO_BGRX8888 3
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#define PC_VIDEO_RGBX8888 4
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#endif /* COSMOPOLITAN_LIBC_RUNTIME_MMAN_H_ */
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