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root / lab5 / graphics.c @ 97

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#include "graphics.h"
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#include "graphics_macros.h"
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#include "errors.h"
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#include <lcom/lcf.h>
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#include <stdio.h>
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static void *video_mem; /** @brief Frame-buffer VM address */
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static vbe_mode_info_t vbe_mem_info;
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//static mmap_t mem_map;
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int (set_graphics_mode)(uint16_t mode) {
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    int r;
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    struct minix_mem_range mmr;
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    mmr.mr_base =  0x0;
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    mmr.mr_limit = 0xFFFFF;
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    struct reg86 reg_86;
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    if ((r = sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mmr)))
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        panic("sys_privctl (ADD MEM) failed: %d\n", r);
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    if (vbe_get_mode_info(mode, &vbe_mem_info)) {
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        printf("vbe_get_mode_info: Failed to get VBE Mode Info for mode %x\n", mode);
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        return LCF_ERROR;
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    }
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    unsigned int vram_base = vbe_mem_info.PhysBasePtr;
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    unsigned int vram_size = vbe_mem_info.XResolution * vbe_mem_info.YResolution * (vbe_mem_info.BitsPerPixel >> 3);
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    // Allow memory mapping
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    mmr.mr_base =  vram_base;
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    mmr.mr_limit = vram_base + vram_size;
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    if ((r = sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mmr)))
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        panic("sys_privctl (ADD MEM) failed: %d\n", r);
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    // Map memory
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    video_mem = vm_map_phys(SELF, (void *)mmr.mr_base, vram_size);
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    if (video_mem == MAP_FAILED)
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        panic("Error: couldn't map video memory.");
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        memset(&reg_86, 0, sizeof(reg_86)); // reset struct
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        reg_86.intno = VC_BIOS_SERV;
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        reg_86.ah = VBE_CALL;
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        reg_86.al = SET_VBE_MD;
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        reg_86.bx = mode | LINEAR_FRAME_BUFFER_MD;
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        // BIOS CALL
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        if (sys_int86(&reg_86)) {
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            printf("%s: sys_int86 failed\n", __func__);
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            return BIOS_CALL_ERROR;
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        }
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        memset(&vbe_mem_info, 0, sizeof(vbe_mode_info_t)); // clear mem_info to initialize it
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//    lm_free(&mem_map);
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    return SUCCESS;
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}