/*
* Insert the gateway page into a set of page tables, creating the
* page tables if necessary.
*/
static void insert_gateway_page(pgd_t *pgd, unsigned long address)
{
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
BUG_ON(!pgd_present(*pgd));
pud = pud_offset(pgd, address);
BUG_ON(!pud_present(*pud));
pmd = pmd_offset(pud, address);
if (!pmd_present(*pmd)) {
pte = alloc_bootmem_pages(PAGE_SIZE);
set_pmd(pmd, __pmd(_PAGE_TABLE | __pa(pte)));
}
pte = pte_offset_kernel(pmd, address);
set_pte(pte, pfn_pte(__pa(gateway_page) >> PAGE_SHIFT, PAGE_READONLY));
}
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
* The parameters are pointers to where to stick the starting and ending
* addresses of available kernel virtual memory.
*/
void __init paging_init(void)
{
struct pglist_data *pgdat = NODE_DATA(0);
unsigned long zones_size[MAX_NR_ZONES] = {0, };
empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
/*
* Set up user data space
*/
set_fs(KERNEL_DS);
/*
* Define zones
*/
zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT;
pgdat->node_zones[ZONE_NORMAL].zone_start_pfn =
__pa(PAGE_OFFSET) >> PAGE_SHIFT;
free_area_init(zones_size);
}
static void __init setup_per_cpu_areas(void)
{
#ifndef __LINSCHED__
unsigned long size, i;
char *ptr;
unsigned long nr_possible_cpus = num_possible_cpus();
/* Copy section for each CPU (we discard the original) */
size = ALIGN(PERCPU_ENOUGH_ROOM, PAGE_SIZE);
ptr = alloc_bootmem_pages(size * nr_possible_cpus);
for_each_possible_cpu(i) {
__per_cpu_offset[i] = ptr - __per_cpu_start;
memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
ptr += size;
}
#else
/* Manually declare all necessary per-cpu areas. As noted in
* percpu.h, this is ugly and does not scale at all, and probably
* needs rethinking eventually. Perhaps the Linux version of
* per-cpu areas can be used again, if someone who understands how
* it could be ported to user space.
*/
ALLOC_PER_CPU_MEM(runqueues);
ALLOC_PER_CPU_MEM(phys_domains);
ALLOC_PER_CPU_MEM(sched_group_phys);
ALLOC_PER_CPU_MEM(current_task);
/* more per_cpu variables would be added here... */
int cpu_id;
for (cpu_id = 0; cpu_id < NR_CPUS; cpu_id++) {
INIT_PER_CPU_MEM(runqueues, cpu_id);
INIT_PER_CPU_MEM(phys_domains, cpu_id);
INIT_PER_CPU_MEM(sched_group_phys, cpu_id);
INIT_PER_CPU_MEM(current_task, cpu_id);
/* more per_cpu variables would be added here... */
}
#endif /* __LINSCHED__ */
}
/**
* init_apic_mappings - initialize APIC mappings
*/
void __init init_apic_mappings(void)
{
/*
* If no local APIC can be found then set up a fake all
* zeroes page to simulate the local APIC and another
* one for the IO-APIC.
*/
if (!smp_found_config && detect_init_APIC()) {
apic_phys = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
apic_phys = __pa(apic_phys);
} else
apic_phys = mp_lapic_addr;
set_fixmap_nocache(FIX_APIC_BASE, apic_phys);
apic_printk(APIC_VERBOSE, "mapped APIC to %16lx (%16lx)\n",
APIC_BASE, apic_phys);
/*
* Fetch the APIC ID of the BSP in case we have a
* default configuration (or the MP table is broken).
*/
boot_cpu_physical_apicid = GET_APIC_ID(read_apic_id());
}
void __init
paging_init(void)
{
int i;
unsigned long zones_size[MAX_NR_ZONES];
printk("Setting up paging and the MMU.\n");
/* Clear out the init_mm.pgd that will contain the kernel's mappings. */
for(i = 0; i < PTRS_PER_PGD; i++)
swapper_pg_dir[i] = __pgd(0);
cris_mmu_init();
/*
* Initialize the bad page table and bad page to point to a couple of
* allocated pages.
*/
empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE);
memset((void *) empty_zero_page, 0, PAGE_SIZE);
/* All pages are DMA'able in Etrax, so put all in the DMA'able zone. */
zones_size[0] = ((unsigned long) high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
for (i = 1; i < MAX_NR_ZONES; i++)
zones_size[i] = 0;
/*
* Use free_area_init_node instead of free_area_init, because it is
* designed for systems where the DRAM starts at an address
* substantially higher than 0, like us (we start at PAGE_OFFSET). This
* saves space in the mem_map page array.
*/
free_area_init_node(0, zones_size, PAGE_OFFSET >> PAGE_SHIFT, 0);
mem_map = contig_page_data.node_mem_map;
}
/*
* Creates a middle page table and puts a pointer to it in the
* given global directory entry. This only returns the gd entry
* in non-PAE compilation mode, since the middle layer is folded.
*/
static pmd_t * __init one_md_table_init(pgd_t *pgd)
{
pud_t *pud;
pmd_t *pmd_table;
#ifdef CONFIG_X86_PAE
if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
if (after_bootmem)
pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
else
pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
return pmd_table;
}
#endif
pud = pud_offset(pgd, 0);
pmd_table = pmd_offset(pud, 0);
return pmd_table;
}
/*
* Creates a middle page table and puts a pointer to it in the
* given global directory entry. This only returns the gd entry
* in non-PAE compilation mode, since the middle layer is folded.
*/
static pmd_t * __init one_md_table_init(pgd_t *pgd)
{
pud_t *pud;
pmd_t *pmd_table;
#ifdef CONFIG_X86_PAE
if (!(pgd_val(*pgd) & _PAGE_PRESENT)) {
if (after_bootmem)
pmd_table = (pmd_t *)alloc_bootmem_pages(PAGE_SIZE);
else
pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
pud = pud_offset(pgd, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
return pmd_table;
}
#endif
pud = pud_offset(pgd, 0); // 32 nopud, 直接return pud_t,没有取地址过程
pmd_table = pmd_offset(pud, 0); // pmd_index 取得pmd号,加上pud的基址
return pmd_table; // 这么一串下来,pmd_table == pgd的地址....
}
void __init
paging_init(void)
{
int i;
unsigned long zones_size[MAX_NR_ZONES];
printk("Setting up paging and the MMU.\n");
for(i = 0; i < PTRS_PER_PGD; i++)
swapper_pg_dir[i] = __pgd(0);
per_cpu(current_pgd, smp_processor_id()) = init_mm.pgd;
tlb_init();
#ifdef CONFIG_CRIS_LOW_MAP
#define CACHED_BOOTROM (KSEG_F | 0x08000000UL)
*R_MMU_KSEG = ( IO_STATE(R_MMU_KSEG, seg_f, seg ) |
IO_STATE(R_MMU_KSEG, seg_e, page ) |
IO_STATE(R_MMU_KSEG, seg_d, page ) |
IO_STATE(R_MMU_KSEG, seg_c, page ) |
IO_STATE(R_MMU_KSEG, seg_b, seg ) |
#ifdef CONFIG_JULIETTE
IO_STATE(R_MMU_KSEG, seg_a, seg ) |
#else
IO_STATE(R_MMU_KSEG, seg_a, page ) |
#endif
IO_STATE(R_MMU_KSEG, seg_9, seg ) |
IO_STATE(R_MMU_KSEG, seg_8, seg ) |
IO_STATE(R_MMU_KSEG, seg_7, page ) |
IO_STATE(R_MMU_KSEG, seg_6, seg ) |
IO_STATE(R_MMU_KSEG, seg_5, seg ) |
IO_STATE(R_MMU_KSEG, seg_4, page ) |
IO_STATE(R_MMU_KSEG, seg_3, page ) |
IO_STATE(R_MMU_KSEG, seg_2, page ) |
IO_STATE(R_MMU_KSEG, seg_1, page ) |
IO_STATE(R_MMU_KSEG, seg_0, page ) );
*R_MMU_KBASE_HI = ( IO_FIELD(R_MMU_KBASE_HI, base_f, 0x3 ) |
IO_FIELD(R_MMU_KBASE_HI, base_e, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_d, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_c, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_b, 0xb ) |
#ifdef CONFIG_JULIETTE
IO_FIELD(R_MMU_KBASE_HI, base_a, 0xa ) |
#else
IO_FIELD(R_MMU_KBASE_HI, base_a, 0x0 ) |
#endif
IO_FIELD(R_MMU_KBASE_HI, base_9, 0x9 ) |
IO_FIELD(R_MMU_KBASE_HI, base_8, 0x8 ) );
*R_MMU_KBASE_LO = ( IO_FIELD(R_MMU_KBASE_LO, base_7, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_6, 0x4 ) |
IO_FIELD(R_MMU_KBASE_LO, base_5, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_4, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_3, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_2, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_1, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_0, 0x0 ) );
#else
#define CACHED_BOOTROM (KSEG_A | 0x08000000UL)
*R_MMU_KSEG = ( IO_STATE(R_MMU_KSEG, seg_f, seg ) |
IO_STATE(R_MMU_KSEG, seg_e, seg ) |
IO_STATE(R_MMU_KSEG, seg_d, page ) |
IO_STATE(R_MMU_KSEG, seg_c, seg ) |
IO_STATE(R_MMU_KSEG, seg_b, seg ) |
IO_STATE(R_MMU_KSEG, seg_a, seg ) |
IO_STATE(R_MMU_KSEG, seg_9, page ) |
IO_STATE(R_MMU_KSEG, seg_8, page ) |
IO_STATE(R_MMU_KSEG, seg_7, page ) |
IO_STATE(R_MMU_KSEG, seg_6, page ) |
IO_STATE(R_MMU_KSEG, seg_5, page ) |
IO_STATE(R_MMU_KSEG, seg_4, page ) |
IO_STATE(R_MMU_KSEG, seg_3, page ) |
IO_STATE(R_MMU_KSEG, seg_2, page ) |
IO_STATE(R_MMU_KSEG, seg_1, page ) |
IO_STATE(R_MMU_KSEG, seg_0, page ) );
*R_MMU_KBASE_HI = ( IO_FIELD(R_MMU_KBASE_HI, base_f, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_e, 0x8 ) |
IO_FIELD(R_MMU_KBASE_HI, base_d, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_c, 0x4 ) |
IO_FIELD(R_MMU_KBASE_HI, base_b, 0xb ) |
IO_FIELD(R_MMU_KBASE_HI, base_a, 0x3 ) |
IO_FIELD(R_MMU_KBASE_HI, base_9, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_8, 0x0 ) );
*R_MMU_KBASE_LO = ( IO_FIELD(R_MMU_KBASE_LO, base_7, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_6, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_5, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_4, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_3, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_2, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_1, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_0, 0x0 ) );
#endif
*R_MMU_CONTEXT = ( IO_FIELD(R_MMU_CONTEXT, page_id, 0 ) );
*R_MMU_CTRL = ( IO_STATE(R_MMU_CTRL, inv_excp, enable ) |
IO_STATE(R_MMU_CTRL, acc_excp, enable ) |
IO_STATE(R_MMU_CTRL, we_excp, enable ) );
*R_MMU_ENABLE = IO_STATE(R_MMU_ENABLE, mmu_enable, enable);
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
zones_size[0] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
for (i = 1; i < MAX_NR_ZONES; i++)
zones_size[i] = 0;
free_area_init_node(0, zones_size, PAGE_OFFSET >> PAGE_SHIFT, 0);
}
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
*/
void __init paging_init(void)
{
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
unsigned long min_addr, max_addr;
unsigned long addr, size, end;
int i;
#ifdef DEBUG
{
extern unsigned long availmem;
printk ("start of paging_init (%p, %lx)\n",
kernel_pg_dir, availmem);
}
#endif
/* Fix the cache mode in the page descriptors for the 680[46]0. */
if (CPU_IS_040_OR_060) {
int i;
#ifndef mm_cachebits
mm_cachebits = _PAGE_CACHE040;
#endif
for (i = 0; i < 16; i++)
pgprot_val(protection_map[i]) |= _PAGE_CACHE040;
}
min_addr = m68k_memory[0].addr;
max_addr = min_addr + m68k_memory[0].size;
for (i = 1; i < m68k_num_memory;) {
if (m68k_memory[i].addr < min_addr) {
printk("Ignoring memory chunk at 0x%lx:0x%lx before the first chunk\n",
m68k_memory[i].addr, m68k_memory[i].size);
printk("Fix your bootloader or use a memfile to make use of this area!\n");
m68k_num_memory--;
memmove(m68k_memory + i, m68k_memory + i + 1,
(m68k_num_memory - i) * sizeof(struct mem_info));
continue;
}
addr = m68k_memory[i].addr + m68k_memory[i].size;
if (addr > max_addr)
max_addr = addr;
i++;
}
m68k_memoffset = min_addr - PAGE_OFFSET;
m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
module_fixup(NULL, __start_fixup, __stop_fixup);
flush_icache();
high_memory = phys_to_virt(max_addr);
min_low_pfn = availmem >> PAGE_SHIFT;
max_low_pfn = max_addr >> PAGE_SHIFT;
for (i = 0; i < m68k_num_memory; i++) {
addr = m68k_memory[i].addr;
end = addr + m68k_memory[i].size;
m68k_setup_node(i);
availmem = PAGE_ALIGN(availmem);
availmem += init_bootmem_node(NODE_DATA(i),
availmem >> PAGE_SHIFT,
addr >> PAGE_SHIFT,
end >> PAGE_SHIFT);
}
/*
* Map the physical memory available into the kernel virtual
* address space. First initialize the bootmem allocator with
* the memory we already mapped, so map_node() has something
* to allocate.
*/
addr = m68k_memory[0].addr;
size = m68k_memory[0].size;
free_bootmem_node(NODE_DATA(0), availmem, min(INIT_MAPPED_SIZE, size) - (availmem - addr));
map_node(0);
if (size > INIT_MAPPED_SIZE)
free_bootmem_node(NODE_DATA(0), addr + INIT_MAPPED_SIZE, size - INIT_MAPPED_SIZE);
for (i = 1; i < m68k_num_memory; i++)
map_node(i);
flush_tlb_all();
/*
* initialize the bad page table and bad page to point
* to a couple of allocated pages
*/
empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
memset(empty_zero_page, 0, PAGE_SIZE);
/*
* Set up SFC/DFC registers
*/
set_fs(KERNEL_DS);
#ifdef DEBUG
printk ("before free_area_init\n");
#endif
for (i = 0; i < m68k_num_memory; i++) {
zones_size[ZONE_DMA] = m68k_memory[i].size >> PAGE_SHIFT;
free_area_init_node(i, pg_data_map + i, zones_size,
m68k_memory[i].addr >> PAGE_SHIFT, NULL);
}
}
void __init
paging_init(void)
{
int i;
unsigned long zones_size[MAX_NR_ZONES];
printk("Setting up paging and the MMU.\n");
/* clear out the init_mm.pgd that will contain the kernel's mappings */
for(i = 0; i < PTRS_PER_PGD; i++)
swapper_pg_dir[i] = __pgd(0);
/* make sure the current pgd table points to something sane
* (even if it is most probably not used until the next
* switch_mm)
*/
current_pgd = init_mm.pgd;
/* initialise the TLB (tlb.c) */
tlb_init();
/* see README.mm for details on the KSEG setup */
#ifdef CONFIG_CRIS_LOW_MAP
/* Etrax-100 LX version 1 has a bug so that we cannot map anything
* across the 0x80000000 boundary, so we need to shrink the user-virtual
* area to 0x50000000 instead of 0xb0000000 and map things slightly
* different. The unused areas are marked as paged so that we can catch
* freak kernel accesses there.
*
* The ARTPEC chip is mapped at 0xa so we pass that segment straight
* through. We cannot vremap it because the vmalloc area is below 0x8
* and Juliette needs an uncached area above 0x8.
*
* Same thing with 0xc and 0x9, which is memory-mapped I/O on some boards.
* We map them straight over in LOW_MAP, but use vremap in LX version 2.
*/
#define CACHED_BOOTROM (KSEG_F | 0x08000000UL)
*R_MMU_KSEG = ( IO_STATE(R_MMU_KSEG, seg_f, seg ) | /* bootrom */
IO_STATE(R_MMU_KSEG, seg_e, page ) |
IO_STATE(R_MMU_KSEG, seg_d, page ) |
IO_STATE(R_MMU_KSEG, seg_c, page ) |
IO_STATE(R_MMU_KSEG, seg_b, seg ) | /* kernel reg area */
#ifdef CONFIG_JULIETTE
IO_STATE(R_MMU_KSEG, seg_a, seg ) | /* ARTPEC etc. */
#else
IO_STATE(R_MMU_KSEG, seg_a, page ) |
#endif
IO_STATE(R_MMU_KSEG, seg_9, seg ) | /* LED's on some boards */
IO_STATE(R_MMU_KSEG, seg_8, seg ) | /* CSE0/1, flash and I/O */
IO_STATE(R_MMU_KSEG, seg_7, page ) | /* kernel vmalloc area */
IO_STATE(R_MMU_KSEG, seg_6, seg ) | /* kernel DRAM area */
IO_STATE(R_MMU_KSEG, seg_5, seg ) | /* cached flash */
IO_STATE(R_MMU_KSEG, seg_4, page ) | /* user area */
IO_STATE(R_MMU_KSEG, seg_3, page ) | /* user area */
IO_STATE(R_MMU_KSEG, seg_2, page ) | /* user area */
IO_STATE(R_MMU_KSEG, seg_1, page ) | /* user area */
IO_STATE(R_MMU_KSEG, seg_0, page ) ); /* user area */
*R_MMU_KBASE_HI = ( IO_FIELD(R_MMU_KBASE_HI, base_f, 0x3 ) |
IO_FIELD(R_MMU_KBASE_HI, base_e, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_d, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_c, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_b, 0xb ) |
#ifdef CONFIG_JULIETTE
IO_FIELD(R_MMU_KBASE_HI, base_a, 0xa ) |
#else
IO_FIELD(R_MMU_KBASE_HI, base_a, 0x0 ) |
#endif
IO_FIELD(R_MMU_KBASE_HI, base_9, 0x9 ) |
IO_FIELD(R_MMU_KBASE_HI, base_8, 0x8 ) );
*R_MMU_KBASE_LO = ( IO_FIELD(R_MMU_KBASE_LO, base_7, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_6, 0x4 ) |
IO_FIELD(R_MMU_KBASE_LO, base_5, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_4, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_3, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_2, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_1, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_0, 0x0 ) );
#else
/* This code is for the corrected Etrax-100 LX version 2... */
#define CACHED_BOOTROM (KSEG_A | 0x08000000UL)
*R_MMU_KSEG = ( IO_STATE(R_MMU_KSEG, seg_f, seg ) | /* cached flash */
IO_STATE(R_MMU_KSEG, seg_e, seg ) | /* uncached flash */
IO_STATE(R_MMU_KSEG, seg_d, page ) | /* vmalloc area */
IO_STATE(R_MMU_KSEG, seg_c, seg ) | /* kernel area */
IO_STATE(R_MMU_KSEG, seg_b, seg ) | /* kernel reg area */
IO_STATE(R_MMU_KSEG, seg_a, seg ) | /* bootrom */
IO_STATE(R_MMU_KSEG, seg_9, page ) | /* user area */
IO_STATE(R_MMU_KSEG, seg_8, page ) |
IO_STATE(R_MMU_KSEG, seg_7, page ) |
IO_STATE(R_MMU_KSEG, seg_6, page ) |
IO_STATE(R_MMU_KSEG, seg_5, page ) |
IO_STATE(R_MMU_KSEG, seg_4, page ) |
IO_STATE(R_MMU_KSEG, seg_3, page ) |
IO_STATE(R_MMU_KSEG, seg_2, page ) |
IO_STATE(R_MMU_KSEG, seg_1, page ) |
IO_STATE(R_MMU_KSEG, seg_0, page ) );
*R_MMU_KBASE_HI = ( IO_FIELD(R_MMU_KBASE_HI, base_f, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_e, 0x8 ) |
IO_FIELD(R_MMU_KBASE_HI, base_d, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_c, 0x4 ) |
IO_FIELD(R_MMU_KBASE_HI, base_b, 0xb ) |
IO_FIELD(R_MMU_KBASE_HI, base_a, 0x3 ) |
IO_FIELD(R_MMU_KBASE_HI, base_9, 0x0 ) |
IO_FIELD(R_MMU_KBASE_HI, base_8, 0x0 ) );
*R_MMU_KBASE_LO = ( IO_FIELD(R_MMU_KBASE_LO, base_7, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_6, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_5, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_4, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_3, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_2, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_1, 0x0 ) |
IO_FIELD(R_MMU_KBASE_LO, base_0, 0x0 ) );
#endif
*R_MMU_CONTEXT = ( IO_FIELD(R_MMU_CONTEXT, page_id, 0 ) );
/* The MMU has been enabled ever since head.S but just to make
* it totally obvious we do it here as well.
*/
*R_MMU_CTRL = ( IO_STATE(R_MMU_CTRL, inv_excp, enable ) |
IO_STATE(R_MMU_CTRL, acc_excp, enable ) |
IO_STATE(R_MMU_CTRL, we_excp, enable ) );
*R_MMU_ENABLE = IO_STATE(R_MMU_ENABLE, mmu_enable, enable);
/*
* initialize the bad page table and bad page to point
* to a couple of allocated pages
*/
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
/* All pages are DMA'able in Etrax, so put all in the DMA'able zone */
zones_size[0] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
for (i = 1; i < MAX_NR_ZONES; i++)
zones_size[i] = 0;
/* Use free_area_init_node instead of free_area_init, because the former
* is designed for systems where the DRAM starts at an address substantially
* higher than 0, like us (we start at PAGE_OFFSET). This saves space in the
* mem_map page array.
*/
free_area_init_node(0, &contig_page_data, zones_size, PAGE_OFFSET >> PAGE_SHIFT, 0);
mem_map = contig_page_data.node_mem_map;
}
/*
* Allocates/reserves the Platform memory resources early in the boot process.
* This ignores any resources that are designated IORESOURCE_IO
*/
void __init platform_alloc_bootmem(void)
{
int i;
int total = 0;
/* Get persistent memory data from command line before allocating
* resources. This need to happen before normal command line parsing
* has been done */
pmem_setup_resource();
/* Loop through looking for resources that want a particular address */
for (i = 0; gp_resources[i].flags != 0; i++) {
int size = gp_resources[i].end - gp_resources[i].start + 1;
if ((gp_resources[i].start != 0) &&
((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
reserve_bootmem(dma_to_phys(gp_resources[i].start),
size, 0);
total += gp_resources[i].end -
gp_resources[i].start + 1;
pr_info("reserve resource %s at %08x (%u bytes)\n",
gp_resources[i].name, gp_resources[i].start,
gp_resources[i].end -
gp_resources[i].start + 1);
}
}
/* Loop through assigning addresses for those that are left */
for (i = 0; gp_resources[i].flags != 0; i++) {
int size = gp_resources[i].end - gp_resources[i].start + 1;
if ((gp_resources[i].start == 0) &&
((gp_resources[i].flags & IORESOURCE_MEM) != 0)) {
void *mem = alloc_bootmem_pages(size);
if (mem == NULL)
pr_err("Unable to allocate bootmem pages "
"for %s\n", gp_resources[i].name);
else {
gp_resources[i].start =
phys_to_dma(virt_to_phys(mem));
gp_resources[i].end =
gp_resources[i].start + size - 1;
total += size;
pr_info("allocate resource %s at %08x "
"(%u bytes)\n",
gp_resources[i].name,
gp_resources[i].start, size);
}
}
}
pr_info("Total Platform driver memory allocation: 0x%08x\n", total);
/* indicate resources that are platform I/O related */
for (i = 0; gp_resources[i].flags != 0; i++) {
if ((gp_resources[i].start != 0) &&
((gp_resources[i].flags & IORESOURCE_IO) != 0)) {
pr_info("reserved platform resource %s at %08x\n",
gp_resources[i].name, gp_resources[i].start);
}
}
}
/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
void __init paging_init(void)
{
pgd_t * pg_dir;
pte_t * pg_table;
int i;
unsigned long address;
unsigned long next_pgtable;
unsigned long bootmem_end;
unsigned long zones_size[3] = {0, 0, 0};
unsigned long size;
#ifdef TEST_VERIFY_AREA
wp_works_ok = 0;
#endif
empty_bad_page_table = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
empty_bad_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
address = PAGE_OFFSET;
pg_dir = swapper_pg_dir;
memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
size = num_pages * sizeof(pte_t);
size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
next_pgtable = (unsigned long)alloc_bootmem_pages(size);
bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
/* Map whole memory from PAGE_OFFSET (0x0E000000) */
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
while (address < (unsigned long)high_memory) {
pg_table = (pte_t *) __pa (next_pgtable);
next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
pgd_val(*pg_dir) = (unsigned long) pg_table;
pg_dir++;
/* now change pg_table to kernel virtual addresses */
pg_table = (pte_t *) __va ((unsigned long) pg_table);
for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
pte_t pte = __mk_pte(address, PAGE_INIT);
if (address >= (unsigned long)high_memory)
pte_val (pte) = 0;
set_pte (pg_table, pte);
address += PAGE_SIZE;
}
}
mmu_emu_init(bootmem_end);
current->mm = NULL;
/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
zones_size[0] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
zones_size[1] = 0;
free_area_init(zones_size);
}
/* now sets up tables using sun3 PTEs rather than i386 as before. --m */
void __init paging_init(void)
{
pgd_t * pg_dir;
pte_t * pg_table;
int i;
unsigned long address;
unsigned long next_pgtable;
unsigned long bootmem_end;
unsigned long zones_size[MAX_NR_ZONES] = { 0, };
unsigned long size;
#ifdef TEST_VERIFY_AREA
wp_works_ok = 0;
#endif
empty_zero_page = alloc_bootmem_pages(PAGE_SIZE);
address = PAGE_OFFSET;
pg_dir = swapper_pg_dir;
memset (swapper_pg_dir, 0, sizeof (swapper_pg_dir));
memset (kernel_pg_dir, 0, sizeof (kernel_pg_dir));
size = num_pages * sizeof(pte_t);
size = (size + PAGE_SIZE) & ~(PAGE_SIZE-1);
next_pgtable = (unsigned long)alloc_bootmem_pages(size);
bootmem_end = (next_pgtable + size + PAGE_SIZE) & PAGE_MASK;
/* Map whole memory from PAGE_OFFSET (0x0E000000) */
pg_dir += PAGE_OFFSET >> PGDIR_SHIFT;
while (address < (unsigned long)high_memory) {
pg_table = (pte_t *) __pa (next_pgtable);
next_pgtable += PTRS_PER_PTE * sizeof (pte_t);
pgd_val(*pg_dir) = (unsigned long) pg_table;
pg_dir++;
/* now change pg_table to kernel virtual addresses */
pg_table = (pte_t *) __va ((unsigned long) pg_table);
for (i=0; i<PTRS_PER_PTE; ++i, ++pg_table) {
pte_t pte = pfn_pte(virt_to_pfn(address), PAGE_INIT);
if (address >= (unsigned long)high_memory)
pte_val (pte) = 0;
set_pte (pg_table, pte);
address += PAGE_SIZE;
}
}
mmu_emu_init(bootmem_end);
current->mm = NULL;
/* memory sizing is a hack stolen from motorola.c.. hope it works for us */
zones_size[ZONE_DMA] = ((unsigned long)high_memory - PAGE_OFFSET) >> PAGE_SHIFT;
/* I really wish I knew why the following change made things better... -- Sam */
/* free_area_init(zones_size); */
free_area_init_node(0, zones_size,
(__pa(PAGE_OFFSET) >> PAGE_SHIFT) + 1, NULL);
}
static void __ref *vmem_alloc_pages(unsigned int order)
{
if (slab_is_available())
return (void *)__get_free_pages(GFP_KERNEL, order);
return alloc_bootmem_pages((1 << order) * PAGE_SIZE);
}