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stdvga: Rework stdvga palette index paging interface functions 

Rename the functions to make them a little easier to understand.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2024-03-31 22:59:06 -04:00
parent 8de51a5af2
commit aa94925d29
3 changed files with 28 additions and 19 deletions
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35
vgasrc/stdvga.c
View File

@ -91,31 +91,36 @@ stdvga_set_palette_blinking(u8 enable_blink)
stdvga_attr_mask(0x10, 0x08, (enable_blink & 0x01) << 3);
}
// Select 4-bit or 6-bit palette indexes (for "page" switching of colors)
void
stdvga_select_video_dac_color_page(u8 flag, u8 data)
stdvga_set_palette_pagesize(u8 pal_pagesize)
{
if (!(flag & 0x01)) {
// select paging mode
stdvga_attr_mask(0x10, 0x80, data << 7);
return;
}
// select page
u8 val = stdvga_attr_read(0x10);
if (!(val & 0x80))
data <<= 2;
data &= 0x0f;
stdvga_attr_write(0x14, data);
stdvga_attr_mask(0x10, 0x80, pal_pagesize << 7);
}
// Set palette index offset (enables color switching via "pages")
void
stdvga_read_video_dac_state(u8 *pmode, u8 *curpage)
stdvga_set_palette_page(u8 pal_page)
{
// Check if using 4-bit or 6-bit "palette index pages"
u8 val = stdvga_attr_read(0x10);
if (!(val & 0x80))
pal_page <<= 2;
// select page
pal_page &= 0x0f;
stdvga_attr_write(0x14, pal_page);
}
// Report current palette index pagesize and current page
void
stdvga_get_palette_page(u8 *pal_pagesize, u8 *pal_page)
{
u8 val1 = stdvga_attr_read(0x10) >> 7;
u8 val2 = stdvga_attr_read(0x14) & 0x0f;
if (!(val1 & 0x01))
val2 >>= 2;
*pmode = val1;
*curpage = val2;
*pal_pagesize = val1;
*pal_page = val2;
}

5
vgasrc/stdvga.h
View File

@ -52,8 +52,9 @@ u8 stdvga_get_overscan_border_color(void);
void stdvga_set_all_palette_reg(u16 seg, u8 *data_far);
void stdvga_get_all_palette_reg(u16 seg, u8 *data_far);
void stdvga_set_palette_blinking(u8 enable_blink);
void stdvga_select_video_dac_color_page(u8 flag, u8 data);
void stdvga_read_video_dac_state(u8 *pmode, u8 *curpage);
void stdvga_set_palette_pagesize(u8 pal_pagesize);
void stdvga_set_palette_page(u8 pal_page);
void stdvga_get_palette_page(u8 *pal_pagesize, u8 *pal_page);
void stdvga_perform_gray_scale_summing(u16 start, u16 count);
void stdvga_set_text_block_specifier(u8 spec);
void stdvga_planar4_plane(int plane);

7
vgasrc/vgabios.c
View File

@ -583,7 +583,10 @@ handle_101012(struct bregs *regs)
static void
handle_101013(struct bregs *regs)
{
stdvga_select_video_dac_color_page(regs->bl, regs->bh);
if (!(regs->bl & 0x01))
stdvga_set_palette_pagesize(regs->bh);
else
stdvga_set_palette_page(regs->bh);
}
static void noinline
@ -617,7 +620,7 @@ handle_101019(struct bregs *regs)
static void
handle_10101a(struct bregs *regs)
{
stdvga_read_video_dac_state(&regs->bl, &regs->bh);
stdvga_get_palette_page(&regs->bl, &regs->bh);
}
static void