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move image boundary to 2MB

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=> which is a requirement of HermitCore's memory management
This commit is contained in:
Stefan Lankes 2016-07-25 07:47:51 +02:00
parent 1d23b3b8dc
commit 52ad45072f
3 changed files with 24 additions and 8 deletions
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3
hermit/arch/x86/loader/entry.asm
View file

@ -42,6 +42,7 @@ extern kernel_end
SECTION .mboot
global start
start:
cli ; avoid any interrupt
jmp stublet
; This part MUST be 4 byte aligned, so we solve that issue using 'ALIGN 4'.
@ -74,7 +75,7 @@ GDT64: ; Global Descriptor Table (64-bit).
dw 0 ; Limit (low).
dw 0 ; Base (low).
db 0 ; Base (middle)
db 10011000b ; Access.
db 10011010b ; Access.
db 00100000b ; Granularity.
db 0 ; Base (high).
.Data: equ $ - GDT64 ; The data descriptor.

24
hermit/arch/x86/loader/main.c
View file

@ -32,6 +32,8 @@
#include <elf.h>
#include <page.h>
#define HALT asm volatile ("hlt")
/*
* Note that linker symbols are not variables, they have no memory allocated for
* maintaining a value, rather their address is their value.
@ -123,22 +125,32 @@ void main(void)
case ELF_PT_LOAD: { // load program segment
size_t viraddr = prog_header->virt_addr;
size_t phyaddr = prog_header->offset + (size_t)header;
const size_t displacement = 0x200000ULL - (phyaddr & 0x1FFFFFULL);
uint32_t npages = (prog_header->file_size >> PAGE_BITS);
if (prog_header->file_size & (PAGE_SIZE-1))
npages++;
kprintf("Map %u pages from physical start address 0x%zx linear to 0x%zx\n", npages, phyaddr, viraddr);
int ret = page_map(viraddr, phyaddr, npages, PG_GLOBAL|PG_RW);
kprintf("Map %u pages from physical start address 0x%zx linear to 0x%zx\n", npages + (displacement >> PAGE_BITS), phyaddr, viraddr);
int ret = page_map(viraddr, phyaddr, npages + (displacement >> PAGE_BITS), PG_GLOBAL|PG_RW);
if (ret)
goto failed;
phyaddr += displacement;
*((uint64_t*) (viraddr + 0x08)) = phyaddr; // physical start address
*((uint32_t*) (viraddr + 0x1C)) = 0; // apicid;
*((uint32_t*) (viraddr + 0x24)) = 1; // number of used cpus
*((uint32_t*) (viraddr + 0x30)) = 0; // apicid
*((uint64_t*) (viraddr + 0x38)) = prog_header->file_size;
*((uint32_t*) (viraddr + 0x60)) = 1; // numa nodes
// move file to a 2 MB boundary
for(size_t va = viraddr+(npages << PAGE_BITS)+displacement-sizeof(uint8_t); va >= viraddr+displacement; va-=sizeof(uint8_t))
*((uint8_t*) va) = *((uint8_t*) (va-displacement));
kprintf("Remap %u pages from physical start address 0x%zx linear to 0x%zx\n", npages, phyaddr, viraddr);
ret = page_map(viraddr, phyaddr, npages, PG_GLOBAL|PG_RW);
if (ret)
goto failed;
}
break;
case ELF_PT_GNU_STACK: // Indicates stack executability => nothing todo
@ -153,11 +165,11 @@ void main(void)
asm volatile ("jmp *%0" :: "r"(header->entry) : "memory");
// we should never reach this point
while(1);
while(1) { HALT; }
failed:
kputs("Upps, kernel panic!\n");
while(1);
while(1) { HALT; }
invalid:
kprintf("Invalid executable!\n");
@ -167,5 +179,5 @@ invalid:
kprintf("elf ident class 0x%x\n", (uint32_t) header->ident._class);
kprintf("elf identdata 0x%x\n", header->ident.data);
kprintf("program entry point 0x%lx\n", (size_t) header->entry);
while(1);
while(1) { HALT; }
}

5
hermit/arch/x86/loader/page.c
View file

@ -209,13 +209,16 @@ int page_init(void)
// we need only the program header of the ELF file
for(int i=0; i<mb_info->mods_count; i++) {
addr = mmodule[i].mod_start;
//npages = PAGE_FLOOR(mmodule[i].mod_end - mmodule[i].mod_start) >> PAGE_BITS;
npages = PAGE_FLOOR(mmodule[i].mod_end - mmodule[i].mod_start) >> PAGE_BITS;
ret = page_map(addr, addr, 1 /*npages*/, PG_GLOBAL);
kprintf("Map first page of module %d at 0x%lx (ret %d)\n", i, addr, ret);
kprintf("Module %d consists %zd\n", i, npages);
}
}
}
// add space for the migration of the elf file
first_page += 0x200000;
kprintf("Page pool starts at 0x%zx\n", first_page);
return 0;