44 lines
917 B
C
44 lines
917 B
C
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#include <arch/io.h>
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#include <stdint.h>
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#include <cpu/amd/vr.h>
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#define VIDEO_MB 8 // MB of video memory
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/*
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* Write to a Virtual Register
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* AX = Class/Index
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* CX = data to write
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*/
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void vrWrite(uint16_t wClassIndex, uint16_t wData)
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{
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outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
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outw(wData, VRC_DATA);
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}
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/*
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* Read from a Virtual Register
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* AX = Class/Index
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* Returns a 16-bit word of data
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*/
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uint16_t vrRead(uint16_t wClassIndex)
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{
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uint16_t wData;
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outl(((uint32_t) VR_UNLOCK << 16) | wClassIndex, VRC_INDEX);
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wData = inw(VRC_DATA);
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return wData;
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}
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/*
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* This function mirrors the Graphics_Init routine in GeodeROM.
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*/
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void graphics_init(void)
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{
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/* SoftVG initialization */
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/* Call SoftVG with the main configuration parameters. */
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/* NOTE: SoftVG expects the memory size to be given in 512 KB pages */
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vrWrite((VRC_VG << 8) + VG_MEM_SIZE, 0x0100 | (VIDEO_MB * 2));
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}
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