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#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
typedef unsigned char u8;
typedef unsigned short u16;
typedef unsigned int u32;
typedef unsigned long long u64;
#ifndef asm
#define asm __asm__ volatile
#endif
struct __attribute__((packed)) multiboot_info
{
/* Multiboot info version number */
u32 flags;
/* Available memory from BIOS */
u32 mem_lower;
u32 mem_upper;
/* "root" partition */
u32 boot_device;
/* Kernel command line */
u32 cmdline;
/* Boot-Module list */
u32 mods_count;
u32 mods_addr;
// union
// {
// multiboot_aout_symbol_table_t aout_sym;
// multiboot_elf_section_header_table_t elf_sec;
// } u;
u32 unused_1;
u32 unused_2;
u32 unused_3;
u32 unused_4;
/* Memory Mapping buffer */
u32 mmap_length;
u32 mmap_addr;
/* Drive Info buffer */
u32 drives_length;
u32 drives_addr;
/* ROM configuration table */
u32 config_table;
/* Boot Loader Name */
u32 boot_loader_name;
/* APM table */
u32 apm_table;
/* Video */
u32 vbe_control_info;
u32 vbe_mode_info;
u16 vbe_mode;
u16 vbe_interface_seg;
u16 vbe_interface_off;
u16 vbe_interface_len;
u64 framebuffer_addr;
u32 framebuffer_pitch;
u32 framebuffer_width;
u32 framebuffer_height;
u8 framebuffer_bpp;
#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB 1
#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT 2
u8 framebuffer_type;
union
{
struct
{
u32 framebuffer_palette_addr;
u16 framebuffer_palette_num_colors;
};
struct
{
u8 framebuffer_red_field_position;
u8 framebuffer_red_mask_size;
u8 framebuffer_green_field_position;
u8 framebuffer_green_mask_size;
u8 framebuffer_blue_field_position;
u8 framebuffer_blue_mask_size;
};
};
};
typedef struct multiboot_info multiboot_info_t;
u8 inportb(u16 port) {
u8 r;
asm("inb %1, %0" : "=a" (r) : "dN" (port));
return r;
}
void outportb(u16 port, u8 data) {
asm("outb %1, %0" : : "dN" (port), "a" (data));
}
// TODO: Why won't this work? void macaroni_panic(char* msg) {
void macaroni_panic() {
// we'll do something with msg later.
while(true){ asm("nop\n\t"); }
}
void macaroni_assert(bool condition) {
if (condition) {
return;
}
macaroni_panic();
}
void cmain(void) {
u32 magic_response = 0x1;
multiboot_info_t* p_multiboot_info;
asm("\t movl %%eax,%0" : "=r"(magic_response));
asm("\t movl %%ebx,%0" : "=r"(p_multiboot_info));
void *fb = (void *) (unsigned long) p_multiboot_info->framebuffer_addr;
u8* pixel = fb;
for (int i = 0; i < 10000; i++) {
*(pixel + i) = i * 2;
}
macaroni_assert(magic_response == 0x2BADB002);
//asm("int $0x13");
}
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