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root / lab5 / graphics.c @ 99

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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 (get_permission)(unsigned int base_addr, unsigned int size) {
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    struct minix_mem_range mmr;
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    mmr.mr_base = base_addr;
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    mmr.mr_limit = base_addr + size;
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    return sys_privctl(SELF, SYS_PRIV_ADD_MEM, &mmr);
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}
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int (get_permissions_first_mbyte)(void) {
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    return get_permission(MBYTE_BASE, MBYTE_SIZE);
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}
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int (vbe_get_mode_information)(uint16_t mode, vbe_mode_info_t *vmi_p) {
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    memset(vmi_p, 0, sizeof(vbe_mode_info_t)); // reset values
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    struct reg86 reg_86;
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    memset(&reg_86, 0, sizeof(reg_86)); // reset struct
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    vbe_mode_info_t *virtual_addr = lm_alloc(sizeof(vbe_mode_info_t), &mem_map);
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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 = VBE_MD_INFO;
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    reg_86.cx = mode;
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    reg_86.es = PB2BASE(mem_map.phys);
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    reg_86.di = PB2OFF(mem_map.phys);
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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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        if (free_memory()) {
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            printf("%s: lm_free failed\n", __func__);
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            return LCF_ERROR;
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        }
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        return BIOS_CALL_ERROR;
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    }
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    vmi_p = memcpy((void*)vmi_p, (void*)virtual_addr, mem_map.size);
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    return SUCCESS;
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}
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int (map_vram)(unsigned int vram_base, unsigned int vram_size) {
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    int r;
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    if ((r = get_permission(vram_base, vram_size)))
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        panic("%s: sys_privctl (ADD MEM) failed: %d\n", __func__, r);
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    video_mem = vm_map_phys(SELF, (void *)vram_base, vram_size);
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    if (video_mem == MAP_FAILED)
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        panic("%s: couldn't map video memory.", __func__);
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    return SUCCESS;
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}
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int (free_memory)(void) {
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    return lm_free(&mem_map);
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}
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int (set_graphics_mode)(uint16_t mode) {
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    struct reg86 reg_86;
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    memset(&reg_86, 0, sizeof(reg_86)); // reset struct
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    // Set Reg86
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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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    return SUCCESS;
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}