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-rw-r--r--arch/sh/kernel/setup.c78
1 files changed, 58 insertions, 20 deletions
diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 14735d5ede52..9c7f7811af70 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -188,6 +188,63 @@ static inline void __init reserve_crashkernel(void)
{}
#endif
+static void __init check_for_initrd(void)
+{
+#ifdef CONFIG_BLK_DEV_INITRD
+ unsigned long start, end;
+
+ /*
+ * Check for the rare cases where boot loaders adhere to the boot
+ * ABI.
+ */
+ if (!LOADER_TYPE || !INITRD_START || !INITRD_SIZE)
+ goto disable;
+
+ start = INITRD_START + __MEMORY_START;
+ end = start + INITRD_SIZE;
+
+ if (unlikely(end <= start))
+ goto disable;
+ if (unlikely(start & ~PAGE_MASK)) {
+ pr_err("initrd must be page aligned\n");
+ goto disable;
+ }
+
+ if (unlikely(start < PAGE_OFFSET)) {
+ pr_err("initrd start < PAGE_OFFSET\n");
+ goto disable;
+ }
+
+ if (unlikely(end > lmb_end_of_DRAM())) {
+ pr_err("initrd extends beyond end of memory "
+ "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
+ end, (unsigned long)lmb_end_of_DRAM());
+ goto disable;
+ }
+
+ /*
+ * If we got this far inspite of the boot loader's best efforts
+ * to the contrary, assume we actually have a valid initrd and
+ * fix up the root dev.
+ */
+ ROOT_DEV = Root_RAM0;
+
+ /*
+ * Address sanitization
+ */
+ initrd_start = (unsigned long)__va(__pa(start));
+ initrd_end = initrd_start + INITRD_SIZE;
+
+ reserve_bootmem(__pa(initrd_start), INITRD_SIZE, BOOTMEM_DEFAULT);
+
+ return;
+
+disable:
+ pr_info("initrd disabled\n");
+ initrd_start = initrd_end = 0;
+#endif
+}
+
void __cpuinit calibrate_delay(void)
{
struct clk *clk = clk_get(NULL, "cpu_clk");
@@ -277,26 +334,7 @@ void __init setup_bootmem_allocator(unsigned long free_pfn)
sparse_memory_present_with_active_regions(0);
-#ifdef CONFIG_BLK_DEV_INITRD
- ROOT_DEV = Root_RAM0;
-
- if (LOADER_TYPE && INITRD_START) {
- unsigned long initrd_start_phys = INITRD_START + __MEMORY_START;
-
- if (initrd_start_phys + INITRD_SIZE <= PFN_PHYS(max_low_pfn)) {
- reserve_bootmem(initrd_start_phys, INITRD_SIZE,
- BOOTMEM_DEFAULT);
- initrd_start = (unsigned long)__va(initrd_start_phys);
- initrd_end = initrd_start + INITRD_SIZE;
- } else {
- printk("initrd extends beyond end of memory "
- "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
- initrd_start_phys + INITRD_SIZE,
- (unsigned long)PFN_PHYS(max_low_pfn));
- initrd_start = 0;
- }
- }
-#endif
+ check_for_initrd();
reserve_crashkernel();
}