Mirroring from commit 106549a4362f6b499da522f8f8f5ed9f98388f87 from Coreboot upstream

2026-02-17 08:55:05 +10:00
commit 5e919b3ee7
279 changed files with 89283 additions and 0 deletions
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+#ifndef __VGABIOS_H
+#define __VGABIOS_H
+
+#include "config.h" // CONFIG_VGA_EMULATE_TEXT
+#include "farptr.h" // GET_FARVAR
+#include "types.h" // u8
+
+// Save/Restore flags
+#define SR_HARDWARE   0x0001
+#define SR_BDA        0x0002
+#define SR_DAC        0x0004
+#define SR_REGISTERS  0x0008
+#define SR_SAVE       0x0100
+#define SR_RESTORE    0x0200
+
+// Mode flags
+#define MF_LEGACY     0x0001
+#define MF_GRAYSUM    0x0002
+#define MF_NOPALETTE  0x0008
+#define MF_CUSTOMCRTC 0x0800
+#define MF_LINEARFB   0x4000
+#define MF_NOCLEARMEM 0x8000
+#define MF_VBEFLAGS   0xfe00
+
+// Memory model types
+#define MM_TEXT            0x00
+#define MM_CGA             0x01
+#define MM_HERCULES        0x02
+#define MM_PLANAR          0x03
+#define MM_PACKED          0x04
+#define MM_NON_CHAIN_4_256 0x05
+#define MM_DIRECT          0x06
+#define MM_YUV             0x07
+
+struct vgamode_s {
+    u8 memmodel;
+    u16 width;
+    u16 height;
+    u8 depth;
+    u8 cwidth;
+    u8 cheight;
+    u16 sstart;
+};
+
+// Custom internal storage in BDA (don't change here without also
+// updating vgaentry.S)
+#define VGA_CUSTOM_BDA 0xb9
+
+struct vga_bda_s {
+    u8 flags;
+    u16 vbe_mode;
+    u16 vgamode_offset;
+} PACKED;
+
+#define BF_PM_MASK      0x0f
+#define BF_EMULATE_TEXT 0x10
+#define BF_SWCURSOR     0x20
+#define BF_EXTRA_STACK  0x40
+
+#define GET_BDA_EXT(var) \
+    GET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var)
+#define SET_BDA_EXT(var, val) \
+    SET_FARVAR(SEG_BDA, ((struct vga_bda_s *)VGA_CUSTOM_BDA)->var, (val))
+#define MASK_BDA_EXT(var, off, on)                                      \
+    SET_BDA_EXT(var, (GET_BDA_EXT(var) & ~(off)) | (on))
+
+static inline int vga_emulate_text(void) {
+    return CONFIG_VGA_EMULATE_TEXT && GET_BDA_EXT(flags) & BF_EMULATE_TEXT;
+}
+
+// Write to global variables (during "post" phase only)
+#define SET_VGA(var, val) SET_FARVAR(get_global_seg(), (var), (val))
+
+// Debug settings
+#define DEBUG_VGA_POST 1
+#define DEBUG_VGA_10 9
+
+// vgabios.c
+int vga_bpp(struct vgamode_s *vmode_g);
+u16 calc_page_size(u8 memmodel, u16 width, u16 height);
+u16 get_cursor_shape(void);
+struct cursorpos get_cursor_pos(u8 page);
+int bda_save_restore(int cmd, u16 seg, void *data);
+struct vgamode_s *get_current_mode(void);
+int vga_set_mode(int mode, int flags);
+extern struct video_func_static static_functionality;
+
+#endif // vgabios.h