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/*
* Kernel image loading.
*
* Copyright (C) 2011 Citrix Systems, Inc.
*/
#include <xen/config.h>
#include <xen/errno.h>
#include <xen/init.h>
#include <xen/lib.h>
#include <xen/mm.h>
#include <xen/domain_page.h>
#include <xen/sched.h>
#include <asm/byteorder.h>
#include <asm/setup.h>
#include "kernel.h"
/* Store kernel in first 8M of flash */
#define KERNEL_FLASH_ADDRESS 0x00000000UL
#define KERNEL_FLASH_SIZE 0x00800000UL
#define ZIMAGE_MAGIC_OFFSET 0x24
#define ZIMAGE_START_OFFSET 0x28
#define ZIMAGE_END_OFFSET 0x2c
#define ZIMAGE_HEADER_LEN 0x30
#define ZIMAGE_MAGIC 0x016f2818
struct minimal_dtb_header {
uint32_t magic;
uint32_t total_size;
/* There are other fields but we don't use them yet. */
};
#define DTB_MAGIC 0xd00dfeed
/**
* copy_from_paddr - copy data from a physical address
* @dst: destination virtual address
* @paddr: source physical address
* @len: length to copy
*/
void copy_from_paddr(void *dst, paddr_t paddr, unsigned long len, int attrindx)
{
void *src = (void *)FIXMAP_ADDR(FIXMAP_MISC);
while (len) {
paddr_t p;
unsigned long l, s;
p = paddr >> PAGE_SHIFT;
s = paddr & (PAGE_SIZE-1);
l = min(PAGE_SIZE - s, len);
set_fixmap(FIXMAP_MISC, p, attrindx);
memcpy(dst, src + s, l);
flush_xen_dcache_va_range(dst, l);
paddr += l;
dst += l;
len -= l;
}
clear_fixmap(FIXMAP_MISC);
}
static void kernel_zimage_load(struct kernel_info *info)
{
paddr_t load_addr = info->zimage.load_addr;
paddr_t paddr = info->zimage.kernel_addr;
paddr_t attr = info->load_attr;
paddr_t len = info->zimage.len;
unsigned long offs;
printk("Loading zImage from %"PRIpaddr" to %"PRIpaddr"-%"PRIpaddr"\n",
paddr, load_addr, load_addr + len);
for ( offs = 0; offs < len; )
{
int rc;
paddr_t s, l, ma;
void *dst;
s = offs & ~PAGE_MASK;
l = min(PAGE_SIZE - s, len);
rc = gvirt_to_maddr(load_addr + offs, &ma);
if ( rc )
{
panic("\nUnable to map translate guest address\n");
return;
}
dst = map_domain_page(ma>>PAGE_SHIFT);
copy_from_paddr(dst + s, paddr + offs, l, attr);
unmap_domain_page(dst);
offs += l;
}
}
/**
* Check the image is a zImage and return the load address and length
*/
static int kernel_try_zimage_prepare(struct kernel_info *info,
paddr_t addr, paddr_t size)
{
uint32_t zimage[ZIMAGE_HEADER_LEN/4];
uint32_t start, end;
struct minimal_dtb_header dtb_hdr;
if ( size < ZIMAGE_HEADER_LEN )
return -EINVAL;
copy_from_paddr(zimage, addr, sizeof(zimage), DEV_SHARED);
if (zimage[ZIMAGE_MAGIC_OFFSET/4] != ZIMAGE_MAGIC)
return -EINVAL;
start = zimage[ZIMAGE_START_OFFSET/4];
end = zimage[ZIMAGE_END_OFFSET/4];
if ( (end - start) > size )
return -EINVAL;
/*
* Check for an appended DTB.
*/
if ( addr + end - start + sizeof(dtb_hdr) <= size )
{
copy_from_paddr(&dtb_hdr, addr + end - start,
sizeof(dtb_hdr), DEV_SHARED);
if (be32_to_cpu(dtb_hdr.magic) == DTB_MAGIC) {
end += be32_to_cpu(dtb_hdr.total_size);
if ( end > addr + size )
return -EINVAL;
}
}
info->zimage.kernel_addr = addr;
/*
* If start is zero, the zImage is position independent -- load it
* at 32k from start of RAM.
*/
if (start == 0)
info->zimage.load_addr = info->mem.bank[0].start + 0x8000;
else
info->zimage.load_addr = start;
info->zimage.len = end - start;
info->entry = info->zimage.load_addr;
info->load = kernel_zimage_load;
return 0;
}
static void kernel_elf_load(struct kernel_info *info)
{
printk("Loading ELF image into guest memory\n");
info->elf.elf.dest = (void*)(unsigned long)info->elf.parms.virt_kstart;
elf_load_binary(&info->elf.elf);
printk("Free temporary kernel buffer\n");
free_xenheap_pages(info->kernel_img, info->kernel_order);
}
static int kernel_try_elf_prepare(struct kernel_info *info,
paddr_t addr, paddr_t size)
{
int rc;
info->kernel_order = get_order_from_bytes(size);
info->kernel_img = alloc_xenheap_pages(info->kernel_order, 0);
if ( info->kernel_img == NULL )
panic("Cannot allocate temporary buffer for kernel.\n");
copy_from_paddr(info->kernel_img, addr, size, info->load_attr);
if ( (rc = elf_init(&info->elf.elf, info->kernel_img, size )) != 0 )
goto err;
#ifdef VERBOSE
elf_set_verbose(&info->elf.elf);
#endif
elf_parse_binary(&info->elf.elf);
if ( (rc = elf_xen_parse(&info->elf.elf, &info->elf.parms)) != 0 )
goto err;
/*
* TODO: can the ELF header be used to find the physical address
* to load the image to? Instead of assuming virt == phys.
*/
info->entry = info->elf.parms.virt_entry;
info->load = kernel_elf_load;
return 0;
err:
free_xenheap_pages(info->kernel_img, info->kernel_order);
return rc;
}
int kernel_prepare(struct kernel_info *info)
{
int rc;
paddr_t start, size;
if ( early_info.modules.nr_mods > 1 )
panic("Cannot handle dom0 initrd yet\n");
if ( early_info.modules.nr_mods < 1 )
{
printk("No boot modules found, trying flash\n");
start = KERNEL_FLASH_ADDRESS;
size = KERNEL_FLASH_SIZE;
info->load_attr = DEV_SHARED;
}
else
{
printk("Loading kernel from boot module 1\n");
start = early_info.modules.module[1].start;
size = early_info.modules.module[1].size;
info->load_attr = BUFFERABLE;
}
rc = kernel_try_zimage_prepare(info, start, size);
if (rc < 0)
rc = kernel_try_elf_prepare(info, start, size);
return rc;
}
void kernel_load(struct kernel_info *info)
{
info->load(info);
}
/*
* Local variables:
* mode: C
* c-set-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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