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https://github.com/isometimes/rpi4-osdev
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62 lines
1.6 KiB
C
62 lines
1.6 KiB
C
#include "../include/wgt.h"
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void vga256(void)
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{
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mbox[0] = 35*4; // Length of message in bytes
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mbox[1] = MBOX_REQUEST;
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mbox[2] = MBOX_TAG_SETPHYWH; // Tag identifier
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mbox[3] = 8; // Value size in bytes
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mbox[4] = 0;
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mbox[5] = 1920; // Value(width)
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mbox[6] = 1080; // Value(height)
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mbox[7] = MBOX_TAG_SETVIRTWH;
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mbox[8] = 8;
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mbox[9] = 8;
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//mbox[10] = 1920;
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//mbox[11] = 1080;
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mbox[10] = 320;
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mbox[11] = 200;
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mbox[12] = MBOX_TAG_SETVIRTOFF;
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mbox[13] = 8;
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mbox[14] = 8;
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mbox[15] = 0; // Value(x)
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mbox[16] = 0; // Value(y)
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mbox[17] = MBOX_TAG_SETDEPTH;
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mbox[18] = 4;
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mbox[19] = 4;
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mbox[20] = 32; // Bits per pixel
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mbox[21] = MBOX_TAG_SETPXLORDR;
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mbox[22] = 4;
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mbox[23] = 4;
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mbox[24] = 1; // RGB
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mbox[25] = MBOX_TAG_GETFB;
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mbox[26] = 8;
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mbox[27] = 8;
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mbox[28] = 4096; // FrameBufferInfo.pointer
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mbox[29] = 0; // FrameBufferInfo.size
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mbox[30] = MBOX_TAG_GETPITCH;
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mbox[31] = 4;
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mbox[32] = 4;
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mbox[33] = 0; // Bytes per line
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mbox[34] = MBOX_TAG_LAST;
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// Check call is successful and we have a pointer with depth 32
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if (mbox_call(MBOX_CH_PROP) && mbox[20] == 32 && mbox[28] != 0) {
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mbox[28] &= 0x3FFFFFFF; // Convert GPU address to ARM address
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WGT_SYS.xres = mbox[10]; // Actual physical width
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WGT_SYS.yres = mbox[11]; // Actual physical height
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WGT_SYS.screenwidth = mbox[10];
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WGT_SYS.screenheight = mbox[11];
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fbuf = (unsigned int *)((long)mbox[28]);
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abuf = fbuf;
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}
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}
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