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stdvga: Add stdvga_set_vertical_size() helper function 

Add helper function and update the bochsvga.c code to use it.  This
emphasizes the relationship between stdvga_get_vertical_size() and
stdvga_set_vertical_size() code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2024-04-02 13:07:58 -04:00
parent 22c9141260
commit c5a361c09a
3 changed files with 13 additions and 7 deletions
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8
vgasrc/bochsvga.c
View File

@ -275,13 +275,7 @@ bochsvga_set_mode(struct vgamode_s *vmode_g, int flags)
stdvga_crtc_write(crtc_addr, 0x11, 0x00);
stdvga_crtc_write(crtc_addr, 0x01, width / 8 - 1);
stdvga_set_linelength(vmode_g, width);
stdvga_crtc_write(crtc_addr, 0x12, height - 1);
u8 v = 0;
if ((height - 1) & 0x0100)
v |= 0x02;
if ((height - 1) & 0x0200)
v |= 0x40;
stdvga_crtc_mask(crtc_addr, 0x07, 0x42, v);
stdvga_set_vertical_size(height);
stdvga_crtc_write(crtc_addr, 0x09, 0x00);
stdvga_crtc_mask(crtc_addr, 0x17, 0x00, 0x03);

11
vgasrc/stdvga.c
View File

@ -286,6 +286,17 @@ stdvga_get_vertical_size(void)
return vde + 1;
}
// Set vertical screen size (number of horizontal lines in the display)
void
stdvga_set_vertical_size(int lines)
{
u16 crtc_addr = stdvga_get_crtc();
u16 vde = lines - 1;
stdvga_crtc_write(crtc_addr, 0x12, vde);
u8 ovl = ((vde >> 7) & 0x02) + ((vde >> 3) & 0x40);
stdvga_crtc_mask(crtc_addr, 0x07, 0x42, ovl);
}
// Get offset into framebuffer accessible from real-mode 64K segment
int
stdvga_get_window(struct vgamode_s *curmode_g, int window)

1
vgasrc/stdvga.h
View File

@ -67,6 +67,7 @@ void stdvga_set_cursor_shape(u16 cursor_type);
void stdvga_set_cursor_pos(int address);
void stdvga_set_character_height(u8 lines);
u16 stdvga_get_vertical_size(void);
void stdvga_set_vertical_size(int lines);
int stdvga_get_window(struct vgamode_s *curmode_g, int window);
int stdvga_set_window(struct vgamode_s *curmode_g, int window, int val);
int stdvga_minimum_linelength(struct vgamode_s *vmode_g);