blob: 4e0da1789da448ddd551d78800d223a683feebcd (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
|
#include <arch/io.h>
#include <stdint.h>
#include <cpu/amd/vr.h>
#define VIDEO_MB 8 // MB of video memory
/*
* Write to a Virtual Register
* AX = Class/Index
* CX = data to write
*/
void vrWrite(uint16_t wClassIndex, uint16_t wData)
{
outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
outw(wData, VRC_DATA);
}
/*
* Read from a Virtual Register
* AX = Class/Index
* Returns a 16-bit word of data
*/
uint16_t vrRead(uint16_t wClassIndex)
{
uint16_t wData;
outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
wData = inw(VRC_DATA);
return wData;
}
/*
* This function mirrors the Graphics_Init routine in GeodeROM.
*/
void graphics_init(void)
{
/* SoftVG initialization */
/* Call SoftVG with the main configuration parameters. */
/* NOTE: SoftVG expects the memory size to be given in 512 KB pages */
vrWrite((VRC_VG << 8) + VG_MEM_SIZE, 0x0100 | (VIDEO_MB * 2));
}
|
