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-rw-r--r--arch/x86/boot/header.S5
-rw-r--r--arch/x86/kernel/setup_32.c130
-rw-r--r--arch/x86/mm/discontig_32.c4
3 files changed, 112 insertions, 27 deletions
diff --git a/arch/x86/boot/header.S b/arch/x86/boot/header.S
index 4cc5b0411db..64ad9016585 100644
--- a/arch/x86/boot/header.S
+++ b/arch/x86/boot/header.S
@@ -195,10 +195,13 @@ cmd_line_ptr: .long 0 # (Header version 0x0202 or later)
# can be located anywhere in
# low memory 0x10000 or higher.
-ramdisk_max: .long (-__PAGE_OFFSET-(512 << 20)-1) & 0x7fffffff
+ramdisk_max: .long 0x7fffffff
# (Header version 0x0203 or later)
# The highest safe address for
# the contents of an initrd
+ # The current kernel allows up to 4 GB,
+ # but leave it at 2 GB to avoid
+ # possible bootloader bugs.
kernel_alignment: .long CONFIG_PHYSICAL_ALIGN #physical addr alignment
#required for protected mode
diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c
index 3bce4af60bb..6802a383077 100644
--- a/arch/x86/kernel/setup_32.c
+++ b/arch/x86/kernel/setup_32.c
@@ -188,9 +188,9 @@ extern int root_mountflags;
unsigned long saved_videomode;
-#define RAMDISK_IMAGE_START_MASK 0x07FF
+#define RAMDISK_IMAGE_START_MASK 0x07FF
#define RAMDISK_PROMPT_FLAG 0x8000
-#define RAMDISK_LOAD_FLAG 0x4000
+#define RAMDISK_LOAD_FLAG 0x4000
static char __initdata command_line[COMMAND_LINE_SIZE];
@@ -252,7 +252,7 @@ static int __init parse_mem(char *arg)
* trim the existing memory map.
*/
unsigned long long mem_size;
-
+
mem_size = memparse(arg, &arg);
limit_regions(mem_size);
user_defined_memmap = 1;
@@ -391,7 +391,7 @@ static void __init reserve_ebda_region(void)
unsigned int addr;
addr = get_bios_ebda();
if (addr)
- reserve_bootmem(addr, PAGE_SIZE);
+ reserve_bootmem(addr, PAGE_SIZE);
}
#ifndef CONFIG_NEED_MULTIPLE_NODES
@@ -496,6 +496,100 @@ static inline void __init reserve_crashkernel(void)
{}
#endif
+#ifdef CONFIG_BLK_DEV_INITRD
+
+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;
+
+ initrd_start = 0;
+
+ if (!boot_params.hdr.type_of_loader ||
+ !ramdisk_image || !ramdisk_size)
+ return; /* No initrd provided by bootloader */
+
+ if (ramdisk_end < ramdisk_image) {
+ printk(KERN_ERR "initrd wraps around end of memory, "
+ "disabling initrd\n");
+ return;
+ }
+ if (ramdisk_size >= end_of_lowmem/2) {
+ printk(KERN_ERR "initrd too large to handle, "
+ "disabling initrd\n");
+ return;
+ }
+ if (ramdisk_end <= end_of_lowmem) {
+ /* All in lowmem, easy case */
+ reserve_bootmem(ramdisk_image, ramdisk_size);
+ initrd_start = ramdisk_image + PAGE_OFFSET;
+ initrd_end = initrd_start+ramdisk_size;
+ return;
+ }
+
+ /* We need to move the initrd down into lowmem */
+ ramdisk_here = (end_of_lowmem - ramdisk_size) & PAGE_MASK;
+
+ /* 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);
+ initrd_start = ramdisk_here + PAGE_OFFSET;
+ initrd_end = initrd_start + ramdisk_size;
+
+ do_relocate_initrd = true;
+}
+
+#define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
+
+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;
+ unsigned long slop, clen, mapaddr;
+ char *p, *q;
+
+ if (!do_relocate_initrd)
+ return;
+
+ ramdisk_here = initrd_start - PAGE_OFFSET;
+
+ q = (char *)initrd_start;
+
+ /* Copy any lowmem portion of the initrd */
+ if (ramdisk_image < end_of_lowmem) {
+ clen = end_of_lowmem - ramdisk_image;
+ p = (char *)__va(ramdisk_image);
+ memcpy(q, p, clen);
+ q += clen;
+ ramdisk_image += clen;
+ ramdisk_size -= clen;
+ }
+
+ /* Copy the highmem portion of the initrd */
+ while (ramdisk_size) {
+ slop = ramdisk_image & ~PAGE_MASK;
+ clen = ramdisk_size;
+ if (clen > MAX_MAP_CHUNK-slop)
+ clen = MAX_MAP_CHUNK-slop;
+ mapaddr = ramdisk_image & PAGE_MASK;
+ p = bt_ioremap(mapaddr, clen+slop);
+ memcpy(q, p+slop, clen);
+ bt_iounmap(p, clen+slop);
+ q += clen;
+ ramdisk_image += clen;
+ ramdisk_size -= clen;
+ }
+}
+
+#endif /* CONFIG_BLK_DEV_INITRD */
+
void __init setup_bootmem_allocator(void)
{
unsigned long bootmap_size;
@@ -551,26 +645,10 @@ void __init setup_bootmem_allocator(void)
*/
find_smp_config();
#endif
- numa_kva_reserve();
#ifdef CONFIG_BLK_DEV_INITRD
- if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image) {
- 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;
-
- if (ramdisk_end <= end_of_lowmem) {
- reserve_bootmem(ramdisk_image, ramdisk_size);
- initrd_start = ramdisk_image + PAGE_OFFSET;
- initrd_end = initrd_start+ramdisk_size;
- } else {
- printk(KERN_ERR "initrd extends beyond end of memory "
- "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
- ramdisk_end, end_of_lowmem);
- initrd_start = 0;
- }
- }
+ reserve_initrd();
#endif
+ numa_kva_reserve();
reserve_crashkernel();
}
@@ -713,15 +791,19 @@ void __init setup_arch(char **cmdline_p)
* NOTE: at this point the bootmem allocator is fully available.
*/
+#ifdef CONFIG_BLK_DEV_INITRD
+ relocate_initrd();
+#endif
+
paravirt_post_allocator_init();
dmi_scan_machine();
- io_delay_init();;
+ io_delay_init();
#ifdef CONFIG_X86_GENERICARCH
generic_apic_probe();
-#endif
+#endif
if (efi_enabled)
efi_map_memmap();
diff --git a/arch/x86/mm/discontig_32.c b/arch/x86/mm/discontig_32.c
index 13a474d3c6e..88a7499e8e4 100644
--- a/arch/x86/mm/discontig_32.c
+++ b/arch/x86/mm/discontig_32.c
@@ -288,8 +288,8 @@ unsigned long __init setup_memory(void)
#ifdef CONFIG_BLK_DEV_INITRD
/* Numa kva area is below the initrd */
- if (boot_params.hdr.type_of_loader && boot_params.hdr.ramdisk_image)
- kva_start_pfn = PFN_DOWN(boot_params.hdr.ramdisk_image)
+ if (initrd_start)
+ kva_start_pfn = PFN_DOWN(initrd_start - PAGE_OFFSET)
- kva_pages;
#endif
kva_start_pfn -= kva_start_pfn & (PTRS_PER_PTE-1);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-24 22:38:34 +0000