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-rw-r--r--arch/mips/kernel/setup.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 85bc601e9a0d..5f8b0a9e30b3 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -375,6 +375,7 @@ static void __init bootmem_init(void)
unsigned long reserved_end;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
+ phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
bool bootmap_valid = false;
int i;
@@ -395,7 +396,8 @@ static void __init bootmem_init(void)
max_low_pfn = 0;
/*
- * Find the highest page frame number we have available.
+ * Find the highest page frame number we have available
+ * and the lowest used RAM address
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end;
@@ -407,6 +409,8 @@ static void __init bootmem_init(void)
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
+ ramstart = min(ramstart, boot_mem_map.map[i].addr);
+
#ifndef CONFIG_HIGHMEM
/*
* Skip highmem here so we get an accurate max_low_pfn if low
@@ -436,6 +440,13 @@ static void __init bootmem_init(void)
mapstart = max(reserved_end, start);
}
+ /*
+ * Reserve any memory between the start of RAM and PHYS_OFFSET
+ */
+ if (ramstart > PHYS_OFFSET)
+ add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
+ BOOT_MEM_RESERVED);
+
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > ARCH_PFN_OFFSET) {
@@ -664,9 +675,6 @@ static int __init early_parse_mem(char *p)
add_memory_region(start, size, BOOT_MEM_RAM);
- if (start && start > PHYS_OFFSET)
- add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET,
- BOOT_MEM_RESERVED);
return 0;
}
early_param("mem", early_parse_mem);