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authorKevin O'Connor <kevin@koconnor.net>2014-10-17 21:17:48 -0400
committerKevin O'Connor <kevin@koconnor.net>2014-10-27 11:00:32 -0400
commit9978d49d1c858087de518a1d7391ba88aa0f5109 (patch)
tree7454cfc81f2c55c6839d06da8814c0a012e9a6e6
parent78c42e504c4a93cc5802415ae5e4f69534e6c0fd (diff)
downloadseabios-9978d49d1c858087de518a1d7391ba88aa0f5109.tar.gz
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vgabios: Don't declare custom internal BDA storage in std/bda.h
The vgabios uses storage in the BDA at offset 0xb9 for internal custom storage (the contents do not appear to be part of any bios standard). Move the description of this custom vgabios area from std/bda.h to vgasrc/vgabios.h. Add two new macros (GET_BDA_EXT and SET_BDA_EXT). This should make it more clear that the area is for custom internal storage. Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
-rw-r--r--src/std/bda.h7
-rw-r--r--vgasrc/vbe.c8
-rw-r--r--vgasrc/vgabios.c8
-rw-r--r--vgasrc/vgabios.h13
4 files changed, 22 insertions, 14 deletions
diff --git a/src/std/bda.h b/src/std/bda.h
index 948bdbf..c321266 100644
--- a/src/std/bda.h
+++ b/src/std/bda.h
@@ -95,12 +95,7 @@ struct bios_data_area_s {
struct segoff_s video_savetable;
u8 other_ac[4];
// 40:B0
- u8 other_b0[9];
- u8 vbe_flag;
- u16 vbe_mode;
- u8 other_bc[4];
- // 40:C0
- u8 other_c0[4*16];
+ u8 other_b0[5*16];
} PACKED;
// BDA floppy_recalibration_status bitdefs
diff --git a/vgasrc/vbe.c b/vgasrc/vbe.c
index 12bd981..06ec22e 100644
--- a/vgasrc/vbe.c
+++ b/vgasrc/vbe.c
@@ -217,7 +217,7 @@ vbe_104f02(struct bregs *regs)
static void
vbe_104f03(struct bregs *regs)
{
- regs->bx = GET_BDA(vbe_mode);
+ regs->bx = GET_BDA_EXT(vbe_mode);
dprintf(1, "VBE current mode=%x\n", regs->bx);
regs->ax = 0x004f;
}
@@ -247,7 +247,7 @@ vbe_104f05(struct bregs *regs)
{
if (regs->bh > 1 || regs->bl > 1)
goto fail;
- if (GET_BDA(vbe_mode) & MF_LINEARFB) {
+ if (GET_BDA_EXT(vbe_mode) & MF_LINEARFB) {
regs->ah = VBE_RETURN_STATUS_INVALID;
return;
}
@@ -382,10 +382,10 @@ vbe_104f10(struct bregs *regs)
regs->bx = 0x0f30;
break;
case 0x01:
- SET_BDA(vbe_flag, regs->bh);
+ SET_BDA_EXT(vbe_flag, regs->bh);
break;
case 0x02:
- regs->bh = GET_BDA(vbe_flag);
+ regs->bh = GET_BDA_EXT(vbe_flag);
break;
default:
regs->ax = 0x014f;
diff --git a/vgasrc/vgabios.c b/vgasrc/vgabios.c
index e87b7eb..d36b62a 100644
--- a/vgasrc/vgabios.c
+++ b/vgasrc/vgabios.c
@@ -252,7 +252,7 @@ bda_save_restore(int cmd, u16 seg, void *data)
, sizeof(info->bda_0x49));
memcpy_far(seg, info->bda_0x84, SEG_BDA, (void*)0x84
, sizeof(info->bda_0x84));
- SET_FARVAR(seg, info->vbe_mode, GET_BDA(vbe_mode));
+ SET_FARVAR(seg, info->vbe_mode, GET_BDA_EXT(vbe_mode));
SET_FARVAR(seg, info->font0, GET_IVT(0x1f));
SET_FARVAR(seg, info->font1, GET_IVT(0x43));
}
@@ -261,7 +261,7 @@ bda_save_restore(int cmd, u16 seg, void *data)
, sizeof(info->bda_0x49));
memcpy_far(SEG_BDA, (void*)0x84, seg, info->bda_0x84
, sizeof(info->bda_0x84));
- SET_BDA(vbe_mode, GET_FARVAR(seg, info->vbe_mode));
+ SET_BDA_EXT(vbe_mode, GET_FARVAR(seg, info->vbe_mode));
SET_IVT(0x1f, GET_FARVAR(seg, info->font0));
SET_IVT(0x43, GET_FARVAR(seg, info->font1));
}
@@ -276,7 +276,7 @@ bda_save_restore(int cmd, u16 seg, void *data)
struct vgamode_s *
get_current_mode(void)
{
- return vgahw_find_mode(GET_BDA(vbe_mode) & ~MF_VBEFLAGS);
+ return vgahw_find_mode(GET_BDA_EXT(vbe_mode) & ~MF_VBEFLAGS);
}
// Setup BDA after a mode switch.
@@ -301,7 +301,7 @@ vga_set_mode(int mode, int flags)
SET_BDA(video_mode, mode);
else
SET_BDA(video_mode, 0xff);
- SET_BDA(vbe_mode, mode | (flags & MF_VBEFLAGS));
+ SET_BDA_EXT(vbe_mode, mode | (flags & MF_VBEFLAGS));
if (memmodel == MM_TEXT) {
SET_BDA(video_cols, width);
SET_BDA(video_rows, height-1);
diff --git a/vgasrc/vgabios.h b/vgasrc/vgabios.h
index 02cf3e3..70682c9 100644
--- a/vgasrc/vgabios.h
+++ b/vgasrc/vgabios.h
@@ -75,6 +75,19 @@ struct gfx_op {
#define GO_MEMSET 3
#define GO_MEMMOVE 4
+// Custom internal storage in BDA
+#define VGA_CUSTOM_BDA 0xb9
+
+struct vga_bda_s {
+ u8 vbe_flag;
+ u16 vbe_mode;
+} PACKED;
+
+#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))
+
// Debug settings
#define DEBUG_VGA_POST 1
#define DEBUG_VGA_10 3