96 lines
2.6 KiB
C
96 lines
2.6 KiB
C
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#include <types.h>
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#include <core.h>
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#include "multiboot.h"
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extern u32_t pg_balloc;
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extern u32_t mem_amount;
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extern u32_t rd_base;
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extern u32_t rd_fat ;
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extern u32_t rd_fat_end ;
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extern u32_t rd_root ;
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extern u32_t rd_root_end ;
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extern multiboot_info_t *boot_mbi;
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/* Check if the bit BIT in FLAGS is set. */
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#define CHECK_FLAG(flags,bit) ((flags) & (1 << (bit)))
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void parse_mbi()
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{
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u32_t last_page = 0;
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if (CHECK_FLAG (boot_mbi->flags, 1))
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DBG ("boot_device = 0x%x\n", (unsigned) boot_mbi->boot_device);
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/* Is the command line passed? */
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if (CHECK_FLAG (boot_mbi->flags, 2))
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DBG ("cmdline = %s\n", (char *) boot_mbi->cmdline);
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/* Are mods_* valid? */
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if (CHECK_FLAG (boot_mbi->flags, 3))
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{
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module_t *mod;
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int i;
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DBG ("mods_count = %d, mods_addr = 0x%x\n",
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(u32_t) boot_mbi->mods_count, (u32_t) boot_mbi->mods_addr);
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for (i = 0, mod = (module_t *) boot_mbi->mods_addr;
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i < boot_mbi->mods_count;i++, mod++)
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{
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pg_balloc = mod->mod_end;
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DBG (" mod_start = 0x%x, mod_end = 0x%x, string = %s\n",
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(u32_t) mod->mod_start,(u32_t) mod->mod_end, (char *) mod->string);
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};
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mod--;
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rd_base = mod->mod_start+OS_BASE;
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rd_fat = rd_base + 512;
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rd_fat_end = rd_base + 512 + 4278;
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rd_root = rd_base + 512*19;
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rd_root_end = rd_base + 512*33;
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// printf(" rd_base = %x\n", rd_base);
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}
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if (CHECK_FLAG (boot_mbi->flags, 6))
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{
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memory_map_t *mmap;
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u32_t page;
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DBG("mmap_addr = 0x%x, mmap_length = 0x%x\n",
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(unsigned) boot_mbi->mmap_addr, (unsigned) boot_mbi->mmap_length);
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for (mmap = (memory_map_t *) boot_mbi->mmap_addr;
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(u32_t) mmap < boot_mbi->mmap_addr + boot_mbi->mmap_length;
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mmap = (memory_map_t *) ((u32_t) mmap
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+ mmap->size + sizeof (mmap->size)))
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{
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u32_t page;
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DBG (" size = 0x%x, base_addr = 0x%x%x,"
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" length = 0x%x%x, type = 0x%x\n",
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(unsigned) mmap->size,
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(unsigned) mmap->base_addr_high,
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(unsigned) mmap->base_addr_low,
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(unsigned) mmap->length_high,
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(unsigned) mmap->length_low,
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(unsigned) mmap->type);
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if( mmap->type != 1)
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continue;
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page = (mmap->base_addr_low+mmap->length_low)&(~4095);
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if(page > last_page)
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last_page = page;
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}
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}
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if(last_page > 256*1024*1024)
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last_page = 256*1024*1024;
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mem_amount = last_page;
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};
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