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microblaze_mmu_v2: MMU initialization

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Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek 2009-05-26 16:30:12 +02:00
parent 3f50425c0c
commit 4dc60832f5
1 changed files with 154 additions and 4 deletions
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158
arch/microblaze/mm/init.c
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@ -23,18 +23,26 @@
#include <asm/sections.h>
#include <asm/tlb.h>
#ifndef CONFIG_MMU
unsigned int __page_offset;
EXPORT_SYMBOL(__page_offset);
#else
DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
int mem_init_done;
static int init_bootmem_done;
#endif /* CONFIG_MMU */
char *klimit = _end;
/*
* Initialize the bootmem system and give it all the memory we
* have available.
*/
unsigned int memory_start;
unsigned int memory_end; /* due to mm/nommu.c */
unsigned int memory_size;
unsigned long memory_start;
unsigned long memory_end; /* due to mm/nommu.c */
unsigned long memory_size;
/*
* paging_init() sets up the page tables - in fact we've already done this.
@ -59,6 +67,7 @@ void __init setup_memory(void)
{
int i;
unsigned long map_size;
#ifndef CONFIG_MMU
u32 kernel_align_start, kernel_align_size;
/* Find main memory where is the kernel */
@ -91,6 +100,7 @@ void __init setup_memory(void)
__func__, kernel_align_start, kernel_align_start
+ kernel_align_size, kernel_align_size);
#endif
/*
* Kernel:
* start: base phys address of kernel - page align
@ -119,9 +129,13 @@ void __init setup_memory(void)
* for 4GB of memory, using 4kB pages), plus 1 page
* (in case the address isn't page-aligned).
*/
#ifndef CONFIG_MMU
map_size = init_bootmem_node(NODE_DATA(0), PFN_UP(TOPHYS((u32)_end)),
min_low_pfn, max_low_pfn);
#else
map_size = init_bootmem_node(&contig_page_data,
PFN_UP(TOPHYS((u32)_end)), min_low_pfn, max_low_pfn);
#endif
lmb_reserve(PFN_UP(TOPHYS((u32)_end)) << PAGE_SHIFT, map_size);
/* free bootmem is whole main memory */
@ -135,6 +149,9 @@ void __init setup_memory(void)
reserve_bootmem(lmb.reserved.region[i].base,
lmb_size_bytes(&lmb.reserved, i) - 1, BOOTMEM_DEFAULT);
}
#ifdef CONFIG_MMU
init_bootmem_done = 1;
#endif
paging_init();
}
@ -189,8 +206,12 @@ void __init mem_init(void)
printk(KERN_INFO "Memory: %luk/%luk available\n",
(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
num_physpages << (PAGE_SHIFT-10));
#ifdef CONFIG_MMU
mem_init_done = 1;
#endif
}
#ifndef CONFIG_MMU
/* Check against bounds of physical memory */
int ___range_ok(unsigned long addr, unsigned long size)
{
@ -198,3 +219,132 @@ int ___range_ok(unsigned long addr, unsigned long size)
((addr + size) > memory_end));
}
EXPORT_SYMBOL(___range_ok);
#else
int page_is_ram(unsigned long pfn)
{
return pfn < max_low_pfn;
}
/*
* Check for command-line options that affect what MMU_init will do.
*/
static void mm_cmdline_setup(void)
{
unsigned long maxmem = 0;
char *p = cmd_line;
/* Look for mem= option on command line */
p = strstr(cmd_line, "mem=");
if (p) {
p += 4;
maxmem = memparse(p, &p);
if (maxmem && memory_size > maxmem) {
memory_size = maxmem;
memory_end = memory_start + memory_size;
lmb.memory.region[0].size = memory_size;
}
}
}
/*
* MMU_init_hw does the chip-specific initialization of the MMU hardware.
*/
static void __init mmu_init_hw(void)
{
/*
* The Zone Protection Register (ZPR) defines how protection will
* be applied to every page which is a member of a given zone. At
* present, we utilize only two of the zones.
* The zone index bits (of ZSEL) in the PTE are used for software
* indicators, except the LSB. For user access, zone 1 is used,
* for kernel access, zone 0 is used. We set all but zone 1
* to zero, allowing only kernel access as indicated in the PTE.
* For zone 1, we set a 01 binary (a value of 10 will not work)
* to allow user access as indicated in the PTE. This also allows
* kernel access as indicated in the PTE.
*/
__asm__ __volatile__ ("ori r11, r0, 0x10000000;" \
"mts rzpr, r11;"
: : : "r11");
}
/*
* MMU_init sets up the basic memory mappings for the kernel,
* including both RAM and possibly some I/O regions,
* and sets up the page tables and the MMU hardware ready to go.
*/
/* called from head.S */
asmlinkage void __init mmu_init(void)
{
unsigned int kstart, ksize;
if (!lmb.reserved.cnt) {
printk(KERN_EMERG "Error memory count\n");
machine_restart(NULL);
}
if ((u32) lmb.memory.region[0].size < 0x1000000) {
printk(KERN_EMERG "Memory must be greater than 16MB\n");
machine_restart(NULL);
}
/* Find main memory where the kernel is */
memory_start = (u32) lmb.memory.region[0].base;
memory_end = (u32) lmb.memory.region[0].base +
(u32) lmb.memory.region[0].size;
memory_size = memory_end - memory_start;
mm_cmdline_setup(); /* FIXME parse args from command line - not used */
/*
* Map out the kernel text/data/bss from the available physical
* memory.
*/
kstart = __pa(CONFIG_KERNEL_START); /* kernel start */
/* kernel size */
ksize = PAGE_ALIGN(((u32)_end - (u32)CONFIG_KERNEL_START));
lmb_reserve(kstart, ksize);
#if defined(CONFIG_BLK_DEV_INITRD)
/* Remove the init RAM disk from the available memory. */
/* if (initrd_start) {
mem_pieces_remove(&phys_avail, __pa(initrd_start),
initrd_end - initrd_start, 1);
}*/
#endif /* CONFIG_BLK_DEV_INITRD */
/* Initialize the MMU hardware */
mmu_init_hw();
/* Map in all of RAM starting at CONFIG_KERNEL_START */
mapin_ram();
#ifdef HIGHMEM_START_BOOL
ioremap_base = HIGHMEM_START;
#else
ioremap_base = 0xfe000000UL; /* for now, could be 0xfffff000 */
#endif /* CONFIG_HIGHMEM */
ioremap_bot = ioremap_base;
/* Initialize the context management stuff */
mmu_context_init();
}
/* This is only called until mem_init is done. */
void __init *early_get_page(void)
{
void *p;
if (init_bootmem_done) {
p = alloc_bootmem_pages(PAGE_SIZE);
} else {
/*
* Mem start + 32MB -> here is limit
* because of mem mapping from head.S
*/
p = __va(lmb_alloc_base(PAGE_SIZE, PAGE_SIZE,
memory_start + 0x2000000));
}
return p;
}
#endif /* CONFIG_MMU */