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determine upper limit of the usable memory

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This commit is contained in:
Stefan Lankes 2016-07-25 19:45:02 +02:00
parent f75dbe82b3
commit f8b2636b59
1 changed files with 5 additions and 0 deletions
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5
hermit/arch/x86/loader/main.c
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@ -45,6 +45,7 @@ extern const void bss_end;
void main(void)
{
size_t limit = 0;
elf_header_t* header = NULL;
// initialize .bss section
@ -68,6 +69,9 @@ void main(void)
/* set the available memory as "unused" */
start_addr = mmap->addr;
end_addr = start_addr + mmap->len;
if (limit < end_addr)
limit = end_addr;
kprintf("Free region 0x%zx - 0x%zx\n", start_addr, end_addr);
}
@ -138,6 +142,7 @@ void main(void)
phyaddr += displacement;
*((uint64_t*) (viraddr + 0x08)) = phyaddr; // physical start address
*((uint64_t*) (viraddr + 0x10)) = limit; // physical limit
*((uint32_t*) (viraddr + 0x24)) = 1; // number of used cpus
*((uint32_t*) (viraddr + 0x30)) = 0; // apicid
*((uint64_t*) (viraddr + 0x38)) = prog_header->file_size;