[MIPS] setup.c: cleanup bootmem_init()
This function although doing simple thing is hard to follow. It's mainly due to: - a lot of #ifdef - bad local names - redundant tests So this patch try to address these issues. It also do not use max_pfn global which is marked as an unused exported symbol. As a bonus side, it's now really easy to see what part of the code is for no-numa system. There's also no point to make this function inline. Signed-off-by: Franck Bui-Huu <vagabon.xyz@gmail.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
parent
b594318259
commit
b6f1f0dea1
|
@ -96,6 +96,12 @@ void __init add_memory_region(phys_t start, phys_t size, long type)
|
|||
int x = boot_mem_map.nr_map;
|
||||
struct boot_mem_map_entry *prev = boot_mem_map.map + x - 1;
|
||||
|
||||
/* Sanity check */
|
||||
if (start + size < start) {
|
||||
printk("Trying to add an invalid memory region, skipped\n");
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Try to merge with previous entry if any. This is far less than
|
||||
* perfect but is sufficient for most real world cases.
|
||||
|
@ -257,15 +263,16 @@ static inline int parse_rd_cmdline(unsigned long* rd_start, unsigned long* rd_en
|
|||
return 0;
|
||||
}
|
||||
|
||||
#define MAXMEM HIGHMEM_START
|
||||
#define MAXMEM_PFN PFN_DOWN(MAXMEM)
|
||||
|
||||
static inline void bootmem_init(void)
|
||||
/*
|
||||
* Initialize the bootmem allocator. It also setup initrd related data
|
||||
* if needed.
|
||||
*/
|
||||
static void __init bootmem_init(void)
|
||||
{
|
||||
unsigned long start_pfn;
|
||||
unsigned long reserved_end = (unsigned long)&_end;
|
||||
#ifndef CONFIG_SGI_IP27
|
||||
unsigned long first_usable_pfn;
|
||||
unsigned long highest = 0;
|
||||
unsigned long mapstart = -1UL;
|
||||
unsigned long bootmap_size;
|
||||
int i;
|
||||
#endif
|
||||
|
@ -281,7 +288,7 @@ static inline void bootmem_init(void)
|
|||
unsigned long tmp;
|
||||
u32 *initrd_header;
|
||||
|
||||
tmp = ((reserved_end + PAGE_SIZE-1) & PAGE_MASK) - sizeof(u32) * 2;
|
||||
tmp = PAGE_ALIGN(reserved_end) - sizeof(u32) * 2;
|
||||
if (tmp < reserved_end)
|
||||
tmp += PAGE_SIZE;
|
||||
initrd_header = (u32 *)tmp;
|
||||
|
@ -294,16 +301,15 @@ static inline void bootmem_init(void)
|
|||
}
|
||||
#endif /* CONFIG_BLK_DEV_INITRD */
|
||||
|
||||
/*
|
||||
* Partially used pages are not usable - thus
|
||||
* we are rounding upwards.
|
||||
*/
|
||||
start_pfn = PFN_UP(CPHYSADDR(reserved_end));
|
||||
|
||||
#ifndef CONFIG_SGI_IP27
|
||||
/* Find the highest page frame number we have available. */
|
||||
max_pfn = 0;
|
||||
first_usable_pfn = -1UL;
|
||||
/*
|
||||
* reserved_end is now a pfn
|
||||
*/
|
||||
reserved_end = PFN_UP(CPHYSADDR(reserved_end));
|
||||
|
||||
/*
|
||||
* Find the highest page frame number we have available.
|
||||
*/
|
||||
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
||||
unsigned long start, end;
|
||||
|
||||
|
@ -312,56 +318,38 @@ static inline void bootmem_init(void)
|
|||
|
||||
start = PFN_UP(boot_mem_map.map[i].addr);
|
||||
end = PFN_DOWN(boot_mem_map.map[i].addr
|
||||
+ boot_mem_map.map[i].size);
|
||||
+ boot_mem_map.map[i].size);
|
||||
|
||||
if (start >= end)
|
||||
if (end > highest)
|
||||
highest = end;
|
||||
if (end <= reserved_end)
|
||||
continue;
|
||||
if (end > max_pfn)
|
||||
max_pfn = end;
|
||||
if (start < first_usable_pfn) {
|
||||
if (start > start_pfn) {
|
||||
first_usable_pfn = start;
|
||||
} else if (end > start_pfn) {
|
||||
first_usable_pfn = start_pfn;
|
||||
}
|
||||
}
|
||||
if (start >= mapstart)
|
||||
continue;
|
||||
mapstart = max(reserved_end, start);
|
||||
}
|
||||
|
||||
/*
|
||||
* Determine low and high memory ranges
|
||||
*/
|
||||
max_low_pfn = max_pfn;
|
||||
if (max_low_pfn > MAXMEM_PFN) {
|
||||
max_low_pfn = MAXMEM_PFN;
|
||||
#ifndef CONFIG_HIGHMEM
|
||||
/* Maximum memory usable is what is directly addressable */
|
||||
printk(KERN_WARNING "Warning only %ldMB will be used.\n",
|
||||
MAXMEM >> 20);
|
||||
printk(KERN_WARNING "Use a HIGHMEM enabled kernel.\n");
|
||||
#endif
|
||||
}
|
||||
|
||||
if (highest > PFN_DOWN(HIGHMEM_START)) {
|
||||
#ifdef CONFIG_HIGHMEM
|
||||
/*
|
||||
* Crude, we really should make a better attempt at detecting
|
||||
* highstart_pfn
|
||||
*/
|
||||
highstart_pfn = highend_pfn = max_pfn;
|
||||
if (max_pfn > MAXMEM_PFN) {
|
||||
highstart_pfn = MAXMEM_PFN;
|
||||
printk(KERN_NOTICE "%ldMB HIGHMEM available.\n",
|
||||
(highend_pfn - highstart_pfn) >> (20 - PAGE_SHIFT));
|
||||
}
|
||||
highstart_pfn = PFN_DOWN(HIGHMEM_START);
|
||||
highend_pfn = highest;
|
||||
#endif
|
||||
highest = PFN_DOWN(HIGHMEM_START);
|
||||
}
|
||||
|
||||
/* Initialize the boot-time allocator with low memory only. */
|
||||
bootmap_size = init_bootmem(first_usable_pfn, max_low_pfn);
|
||||
/*
|
||||
* Initialize the boot-time allocator with low memory only.
|
||||
*/
|
||||
bootmap_size = init_bootmem(mapstart, highest);
|
||||
|
||||
/*
|
||||
* Register fully available low RAM pages with the bootmem allocator.
|
||||
*/
|
||||
for (i = 0; i < boot_mem_map.nr_map; i++) {
|
||||
unsigned long curr_pfn, last_pfn, size;
|
||||
unsigned long start, end, size;
|
||||
|
||||
/*
|
||||
* Reserve usable memory.
|
||||
|
@ -369,49 +357,37 @@ static inline void bootmem_init(void)
|
|||
if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* We are rounding up the start address of usable memory:
|
||||
*/
|
||||
curr_pfn = PFN_UP(boot_mem_map.map[i].addr);
|
||||
if (curr_pfn >= max_low_pfn)
|
||||
continue;
|
||||
if (curr_pfn < start_pfn)
|
||||
curr_pfn = start_pfn;
|
||||
|
||||
/*
|
||||
* ... and at the end of the usable range downwards:
|
||||
*/
|
||||
last_pfn = PFN_DOWN(boot_mem_map.map[i].addr
|
||||
start = PFN_UP(boot_mem_map.map[i].addr);
|
||||
end = PFN_DOWN(boot_mem_map.map[i].addr
|
||||
+ boot_mem_map.map[i].size);
|
||||
|
||||
if (last_pfn > max_low_pfn)
|
||||
last_pfn = max_low_pfn;
|
||||
/*
|
||||
* We are rounding up the start address of usable memory
|
||||
* and at the end of the usable range downwards.
|
||||
*/
|
||||
if (start >= max_low_pfn)
|
||||
continue;
|
||||
if (start < reserved_end)
|
||||
start = reserved_end;
|
||||
if (end > max_low_pfn)
|
||||
end = max_low_pfn;
|
||||
|
||||
/*
|
||||
* Only register lowmem part of lowmem segment with bootmem.
|
||||
* ... finally, is the area going away?
|
||||
*/
|
||||
size = last_pfn - curr_pfn;
|
||||
if (curr_pfn > PFN_DOWN(HIGHMEM_START))
|
||||
continue;
|
||||
if (curr_pfn + size - 1 > PFN_DOWN(HIGHMEM_START))
|
||||
size = PFN_DOWN(HIGHMEM_START) - curr_pfn;
|
||||
if (!size)
|
||||
continue;
|
||||
|
||||
/*
|
||||
* ... finally, did all the rounding and playing
|
||||
* around just make the area go away?
|
||||
*/
|
||||
if (last_pfn <= curr_pfn)
|
||||
if (end <= start)
|
||||
continue;
|
||||
size = end - start;
|
||||
|
||||
/* Register lowmem ranges */
|
||||
free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
|
||||
memory_present(0, curr_pfn, curr_pfn + size - 1);
|
||||
free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
|
||||
memory_present(0, start, end);
|
||||
}
|
||||
|
||||
/* Reserve the bootmap memory. */
|
||||
reserve_bootmem(PFN_PHYS(first_usable_pfn), bootmap_size);
|
||||
/*
|
||||
* Reserve the bootmap memory.
|
||||
*/
|
||||
reserve_bootmem(PFN_PHYS(mapstart), bootmap_size);
|
||||
|
||||
#endif /* CONFIG_SGI_IP27 */
|
||||
|
||||
#ifdef CONFIG_BLK_DEV_INITRD
|
||||
|
@ -483,6 +459,9 @@ static void __init arch_mem_init(char **cmdline_p)
|
|||
paging_init();
|
||||
}
|
||||
|
||||
#define MAXMEM HIGHMEM_START
|
||||
#define MAXMEM_PFN PFN_DOWN(MAXMEM)
|
||||
|
||||
static inline void resource_init(void)
|
||||
{
|
||||
int i;
|
||||
|
|
Loading…
Reference in a new issue