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Subject[PATCH] x86: extend e820 ealy_res support 32bit - fix v2
Date
[PATCH] x86: extend e820 ealy_res support 32bit - fix v2

use find_e820_area to find addess for new RAMDISK, instead of using ram blindly

also print out low ram and bootmap info

v2: remove extra -1 in reaseve_early calling
panic if can not find space for new RAMDISK

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>

Index: linux-2.6/arch/x86/kernel/setup_32.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/setup_32.c
+++ linux-2.6/arch/x86/kernel/setup_32.c
@@ -466,11 +466,11 @@ static bool do_relocate_initrd = false;

static void __init reserve_initrd(void)
{
- unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
- unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
- unsigned long ramdisk_end = ramdisk_image + ramdisk_size;
- unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
- unsigned long ramdisk_here;
+ u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+ u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+ u64 ramdisk_end = ramdisk_image + ramdisk_size;
+ u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
+ u64 ramdisk_here;

if (!boot_params.hdr.type_of_loader ||
!ramdisk_image || !ramdisk_size)
@@ -478,14 +478,8 @@ static void __init reserve_initrd(void)

initrd_start = 0;

- if (ramdisk_end < ramdisk_image) {
- free_bootmem(ramdisk_image, ramdisk_size);
- printk(KERN_ERR "initrd wraps around end of memory, "
- "disabling initrd\n");
- return;
- }
if (ramdisk_size >= end_of_lowmem/2) {
- free_bootmem(ramdisk_image, ramdisk_size);
+ free_early(ramdisk_image, ramdisk_end);
printk(KERN_ERR "initrd too large to handle, "
"disabling initrd\n");
return;
@@ -495,8 +489,7 @@ static void __init reserve_initrd(void)
/* All in lowmem, easy case */
/*
* don't need to reserve again, already reserved early
- * in i386_start_kernel, and early_res_to_bootmem
- * convert that to reserved in bootmem
+ * in i386_start_kernel
*/
initrd_start = ramdisk_image + PAGE_OFFSET;
initrd_end = initrd_start+ramdisk_size;
@@ -504,11 +497,18 @@ static void __init reserve_initrd(void)
}

/* We need to move the initrd down into lowmem */
- ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
+ ramdisk_here = find_e820_area(min_low_pfn<<PAGE_SHIFT,
+ end_of_lowmem, ramdisk_size,
+ PAGE_SIZE);
+
+ if (ramdisk_here == -1ULL)
+ panic("Cannot find placce for new RAMDISK of size %lld\n",
+ ramdisk_size);

/* Note: this includes all the lowmem currently occupied by
the initrd, we rely on that fact to keep the data intact. */
- reserve_bootmem(ramdisk_here, ramdisk_size, BOOTMEM_DEFAULT);
+ reserve_early(ramdisk_here, ramdisk_here + ramdisk_size,
+ "NEW RAMDISK");
initrd_start = ramdisk_here + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;

@@ -519,10 +519,10 @@ static void __init reserve_initrd(void)

static void __init relocate_initrd(void)
{
- unsigned long ramdisk_image = boot_params.hdr.ramdisk_image;
- unsigned long ramdisk_size = boot_params.hdr.ramdisk_size;
- unsigned long end_of_lowmem = max_low_pfn << PAGE_SHIFT;
- unsigned long ramdisk_here;
+ u64 ramdisk_image = boot_params.hdr.ramdisk_image;
+ u64 ramdisk_size = boot_params.hdr.ramdisk_size;
+ u64 end_of_lowmem = max_low_pfn << PAGE_SHIFT;
+ u64 ramdisk_here;
unsigned long slop, clen, mapaddr;
char *p, *q;

@@ -540,6 +540,8 @@ static void __init relocate_initrd(void)
memcpy(q, p, clen);
q += clen;
/* need to free these low pages...*/
+ printk(KERN_INFO "Freeing old partial RAMDISK %08llx-%08llx\n",
+ ramdisk_image, ramdisk_image + clen - 1);
free_bootmem(ramdisk_image, clen);
ramdisk_image += clen;
ramdisk_size -= clen;
@@ -560,6 +562,11 @@ static void __init relocate_initrd(void)
ramdisk_size -= clen;
}
/* high pages is not converted by early_res_to_bootmem */
+ ramdisk_image = boot_params.hdr.ramdisk_image;
+ ramdisk_size = boot_params.hdr.ramdisk_size;
+ printk(KERN_INFO "Copied RAMDISK from %016llx - %016llx to %08llx - %08llx\n",
+ ramdisk_image, ramdisk_image + ramdisk_size - 1,
+ ramdisk_here, ramdisk_here + ramdisk_size - 1);
}

#endif /* CONFIG_BLK_DEV_INITRD */
@@ -576,10 +583,17 @@ void __init setup_bootmem_allocator(void
PAGE_SIZE);
if (bootmap == -1L)
panic("Cannot find bootmem map of size %ld\n", bootmap_size);
+ reserve_early(bootmap, bootmap + bootmap_size, "BOOTMAP");
+#ifdef CONFIG_BLK_DEV_INITRD
+ reserve_initrd();
+#endif
bootmap_size = init_bootmem(bootmap >> PAGE_SHIFT, max_low_pfn);
+ printk(KERN_INFO " low ram: %08lx - %08lx\n",
+ min_low_pfn<<PAGE_SHIFT, max_low_pfn<<PAGE_SHIFT);
+ printk(KERN_INFO " bootmap %08lx - %08lx\n",
+ bootmap, bootmap + bootmap_size);
register_bootmem_low_pages(max_low_pfn);
early_res_to_bootmem(0, max_low_pfn<<PAGE_SHIFT);
- reserve_bootmem(bootmap, bootmap_size, BOOTMEM_DEFAULT);

#ifdef CONFIG_ACPI_SLEEP
/*
@@ -593,9 +607,6 @@ void __init setup_bootmem_allocator(void
*/
find_smp_config();
#endif
-#ifdef CONFIG_BLK_DEV_INITRD
- reserve_initrd();
-#endif
numa_kva_reserve();
reserve_crashkernel();


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