diff options
Diffstat (limited to 'src/vga.c')
| -rw-r--r-- | src/vga.c | 34 |
1 files changed, 31 insertions, 3 deletions
@@ -53,12 +53,41 @@ void vga_set_cursor( vga_t *vga, const int x, const int y ) void vga_set_cursor_from_hardware( vga_t *vga ) { + // value of port we want to see later in assembly + uint16_t n = vga->crtc_index_port.number; + vga_put_hex( vga, n ); + vga_put_newline( vga ); + + // the address of the vga structure + uintptr_t uip = (uintptr_t)( (void *)vga ); + vga_put_hex( vga, uip ); + vga_put_newline( vga ); + + // the address of the port structure inside the vga structure + uintptr_t uip2 = (uintptr_t)( (void *)&vga->crtc_index_port ); + vga_put_hex( vga, uip2 ); + vga_put_newline( vga ); + + // the address of the number membger in the port structure inside the vga structure + // must be the same as uip2 by C99 + uintptr_t uip3 = (uintptr_t)( (void *)&vga->crtc_index_port.number ); + vga_put_hex( vga, uip3 ); + vga_put_newline( vga ); + + uint8_t data = port8_read( &(vga->crtc_index_port ) ); + vga_put_hex( vga, data ); + vga_put_newline( vga ); +//~ unsigned short offset; + //~ out(0x3D4, 14); + //~ offset = in(0x3D5) << 8; + //~ out(0x3D4, 15); + //~ offset |= in(0x3D5); } void vga_set_cursor_on_hardware( vga_t *vga ) { uint16_t hw_cursor_pos = vga->cursor_x + vga->cursor_y * vga->res_x; - + port8_write( &vga->crtc_index_port, 15 ); port8_write( &vga->crtc_index_port, hw_cursor_pos & 0xff ); port8_write( &vga->crtc_index_port, 14 ); @@ -164,8 +193,7 @@ void vga_put_hex( vga_t *vga, const uint32_t v ) { char buf[9]; - strlcpy( buf, "0x", 9 ); - vga_put_string( vga, (const char *)buf ); + vga_put_string( vga, "0x" ); itoa( v, (char *)buf, 16 ); vga_put_string( vga, (const char *)buf ); } |