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#include <arch/io.h>
#include <stdint.h>
#define VIDEO_MB 8 // MB of video memory
#define VRC_INDEX 0xAC1C // Index register
#define VRC_DATA 0xAC1E // Data register
#define VR_UNLOCK 0xFC53 // Virtual register unlock code
#define VRC_VG 0x02 // SoftVG Class
#define VG_MEM_SIZE 0x00 // bits 7:0 - 512K unit size, bit 8 controller priority
/*
* Write to a Virtual Register
* AX = Class/Index
* CX = data to write
*/
static void vrWrite(uint16_t wClassIndex, uint16_t wData)
{
outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
outw(wData, VRC_DATA);
}
/*
* 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));
}
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