57 lines
1.8 KiB
C
57 lines
1.8 KiB
C
#include "type.h"
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#include "protect.h"
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#include "string.h"
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#include "cmatrix.h"
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#include "terminal.h"
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u8 gdt_ptr[6]; /* 0~15:Limit 16~47:Base */
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DESCRIPTOR gdt[GDT_SIZE];
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void cstart()
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{
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/* 将 LOADER 中的 GDT 复制到新的 GDT 中 */
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memcpy(&gdt, /* New GDT */
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(void *)(*((u32 *)(&gdt_ptr[2]))), /* Base of Old GDT */
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*((u16 *)(&gdt_ptr[0])) + 1 /* Limit of Old GDT */
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);
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/* gdt_ptr[6] 共 6 个字节：0~15:Limit 16~47:Base。用作 sgdt/lgdt 的参数。*/
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u16 *p_gdt_limit = (u16 *)(&gdt_ptr[0]);
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u32 *p_gdt_base = (u32 *)(&gdt_ptr[2]);
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*p_gdt_limit = GDT_SIZE * sizeof(DESCRIPTOR) - 1;
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*p_gdt_base = (u32)&gdt;
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// 在终端的第1行依次打出N(黑底白字)，W(黑底蓝字)，P(白底蓝字)，U(白底黑字)
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kprintf(TERMINAL_POS(1, 0),
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"N%fW%bP%fU", LIGHT_BLUE, WHITE, BLACK);
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// 在终端的第2行依次输出白底绿紫相间的字符
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for (char *s = "even old new york once Amsterdam",
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*st = s ; *s ; s += 4) {
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kprintf(TERMINAL_POS(2, s - st),
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"%b%f%c%f%c%f%c%f%c",
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WHITE, GREEN, *(s + 0),
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FUCHUSIA, *(s + 1), GREEN,
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*(s + 2), FUCHUSIA, *(s + 3));
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}
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#ifdef TESTS
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//在终端第3，4行分别输出两句话，而且两行的格式相同
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//第3行为绿底黄字，第4行为黄底绿字
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for (char *s1 = "never gonna give you up ", *st1 = s1,
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*s2 = "never gonna let you down" ; *s1 ; s1 += 2, s2 += 2) {
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struct color_char c1 = {
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.background = YELLOW,
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.foreground = GREEN,
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.print_char = *(s2 + 0),
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.print_pos = TERMINAL_POS(4, s1 - st1 + 0),
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};
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struct color_char c2 = {
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.background = YELLOW,
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.foreground = GREEN,
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.print_char = *(s2 + 1),
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.print_pos = TERMINAL_POS(4, s1 - st1 + 1),
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};
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kprintf(TERMINAL_POS(3, s1 - st1),
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"%b%f%c%s%c%s",
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GREEN, YELLOW, *(s1 + 0), c1, *(s1 + 1), c2);
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}
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#endif
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}
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