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226 lines
5.1 KiB
C
226 lines
5.1 KiB
C
/* Copyright (C) 2021,2022 fef <owo@fef.moe>. All rights reserved. */
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#include <string.h>
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#include <arch/interrupt.h>
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#include <arch/multiboot.h>
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#include <arch/port.h>
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#include <arch/vmparam.h>
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#include <gay/cdefs.h>
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#include <gay/kprintf.h>
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#include <gay/mm.h>
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#include <gay/types.h>
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#include <gay/util.h>
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enum vga_color {
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VGA_COLOR_BLACK = 0,
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VGA_COLOR_BLUE = 1,
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VGA_COLOR_GREEN = 2,
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VGA_COLOR_CYAN = 3,
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VGA_COLOR_RED = 4,
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VGA_COLOR_MAGENTA = 5,
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VGA_COLOR_BROWN = 6,
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VGA_COLOR_LIGHT_GREY = 7,
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VGA_COLOR_DARK_GREY = 8,
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VGA_COLOR_LIGHT_BLUE = 9,
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VGA_COLOR_LIGHT_GREEN = 10,
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VGA_COLOR_LIGHT_CYAN = 11,
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VGA_COLOR_LIGHT_RED = 12,
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VGA_COLOR_LIGHT_MAGENTA = 13,
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VGA_COLOR_LIGHT_BROWN = 14,
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VGA_COLOR_WHITE = 15,
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};
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/*
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* The character framebuffer sits at physical address 0x000b8000.
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* The entire low memory is always mapped to KERNBASE upwards.
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*/
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#define FB_ADDRESS (0x000b8000 + KERNBASE)
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#define FB_LINES 24
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#define FB_COLS 80
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struct fb_cell {
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u8 c;
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enum vga_color fg:4;
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enum vga_color bg:4;
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} __packed;
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/** @brief BIOS provided character framebuffer */
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static volatile struct fb_cell *const framebuffer = (volatile struct fb_cell *)FB_ADDRESS;
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/** @brief current line in the framebuffer */
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static unsigned int fb_line;
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/** @brief current column in the framebuffer */
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static unsigned int fb_col;
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/** @brief current background color */
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enum vga_color fb_background;
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/** @brief current foreground color */
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enum vga_color fb_foreground;
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#define cell_at(line, col) ( &framebuffer[(line) * FB_COLS + (col)] )
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#define current_cell (cell_at(fb_line, fb_col))
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static isize fb_write(struct kprintf_printer *printer, const void *buf, usize size);
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static isize fb_flush(struct kprintf_printer *printer);
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static struct kprintf_printer fb_kprintf_printer = {
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.write = fb_write,
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.flush = fb_flush,
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};
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static void fb_newline(void);
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static void fb_clear(void);
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static void fb_init(enum vga_color fg, enum vga_color bg);
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static void print_gay_propaganda(void);
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static struct mb2_tag *next_tag(struct mb2_tag *tag);
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static void handle_tag(struct mb2_tag *tag);
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extern int main(int argc, char *argv[]);
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__asmlink void _boot(void *address)
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{
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volatile int x = 69420;
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while (x == 69420);
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kprintf_set_printer(&fb_kprintf_printer);
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fb_init(VGA_COLOR_LIGHT_GREY, VGA_COLOR_BLACK);
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x86_setup_interrupts();
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print_gay_propaganda();
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/* the +8 for the address has something to do with the tags
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* being embedded in another struct iirc, but i have no idea what
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* that was and quite honestly i'm just glad it works at all. */
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for (struct mb2_tag *tag = address + 8; tag != NULL; tag = next_tag(tag))
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handle_tag(tag);
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main(0, nil);
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}
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static inline void handle_tag(struct mb2_tag *tag)
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{
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switch (tag->type) {
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case MB2_TAG_TYPE_END:
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break;
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case MB2_TAG_TYPE_CMDLINE:
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kprintf("Kernel command line: %s\n", ((struct mb2_tag_string *)tag)->string);
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break;
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case MB2_TAG_TYPE_MMAP:
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x86_paging_init((struct mb2_tag_mmap *)tag);
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break;
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default:
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//kprintf("Unknown tag %u\n", tag->type);
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break;
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}
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}
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static inline struct mb2_tag *next_tag(struct mb2_tag *tag)
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{
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if (tag->type == MB2_TAG_TYPE_END)
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return NULL;
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else
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return (void *)tag + ( (tag->size + 7) & ~7 );
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}
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static void fb_newline(void)
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{
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fb_col = 0;
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if (fb_line == FB_LINES - 1) {
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void *first_row = (void *)cell_at(0, 0);
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void *second_row = (void *)cell_at(1, 0);
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void *last_row_end = (void *)cell_at(FB_LINES, FB_COLS);
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memmove(first_row, second_row, last_row_end - second_row);
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} else {
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fb_line++;
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}
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}
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static isize fb_write(struct kprintf_printer *printer, const void *buf, usize size)
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{
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isize ret = 0;
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const u8 *s = buf;
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while (size > s - (const u8 *)buf) {
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u8 c = *s++;
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ret++;
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if (fb_col == FB_COLS)
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fb_newline();
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if (c == '\n') {
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fb_newline();
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continue;
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}
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current_cell->c = c;
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current_cell->fg = fb_foreground;
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current_cell->bg = fb_background;
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fb_col++;
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}
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return ret;
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}
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static isize fb_flush(struct kprintf_printer *printer)
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{
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return 0;
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}
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static void fb_clear(void)
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{
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for (unsigned int l = 0; l < FB_LINES; l++) {
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for (unsigned int c = 0; c < FB_COLS; c++) {
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cell_at(l, c)->c = ' ';
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cell_at(l, c)->fg = fb_foreground;
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cell_at(l, c)->bg = fb_background;
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}
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}
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}
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static void fb_init(enum vga_color fg, enum vga_color bg)
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{
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fb_line = 0;
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fb_col = 0;
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fb_foreground = fg;
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fb_background = bg;
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/* disable cursor */
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x86_outb(0x3D4, 0x0A);
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x86_outb(0x3D5, 0x20);
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fb_clear();
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}
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static void print_gay_propaganda(void)
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{
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static const enum vga_color rainbow[] = {
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VGA_COLOR_RED,
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VGA_COLOR_LIGHT_RED,
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VGA_COLOR_LIGHT_BROWN,
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VGA_COLOR_GREEN,
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VGA_COLOR_BLUE,
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VGA_COLOR_MAGENTA,
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};
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static char line[FB_COLS];
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memset(line, ' ', FB_COLS);
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enum vga_color bg_before = fb_background;
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enum vga_color fg_before = fb_foreground;
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for (int i = 0; i < ARRAY_SIZE(rainbow); i++) {
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fb_background = rainbow[i];
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fb_write(NULL, line, FB_COLS);
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}
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fb_background = bg_before;
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kprintf("\nWelcome to ");
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const char *gaybsd = "GayBSD";
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for (const char *tmp = gaybsd; *tmp != '\0'; tmp++) {
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fb_foreground = rainbow[tmp - gaybsd];
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kprintf("%c", *tmp);
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}
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fb_foreground = fg_before;
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kprintf(", be gay do crime!\n\n");
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}
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