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-rw-r--r--arch/csky/mm/init.c219
1 files changed, 219 insertions, 0 deletions
diff --git a/arch/csky/mm/init.c b/arch/csky/mm/init.c
new file mode 100644
index 0000000000..bde7cabd23
--- /dev/null
+++ b/arch/csky/mm/init.c
@@ -0,0 +1,219 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
+
+#include <linux/bug.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/pagemap.h>
+#include <linux/ptrace.h>
+#include <linux/mman.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/memblock.h>
+#include <linux/swap.h>
+#include <linux/proc_fs.h>
+#include <linux/pfn.h>
+#include <linux/initrd.h>
+
+#include <asm/setup.h>
+#include <asm/cachectl.h>
+#include <asm/dma.h>
+#include <asm/pgalloc.h>
+#include <asm/mmu_context.h>
+#include <asm/sections.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+
+#define PTRS_KERN_TABLE \
+ ((PTRS_PER_PGD - USER_PTRS_PER_PGD) * PTRS_PER_PTE)
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
+pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
+pte_t kernel_pte_tables[PTRS_KERN_TABLE] __page_aligned_bss;
+
+EXPORT_SYMBOL(invalid_pte_table);
+unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
+ __page_aligned_bss;
+EXPORT_SYMBOL(empty_zero_page);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+static void __init setup_initrd(void)
+{
+ unsigned long size;
+
+ if (initrd_start >= initrd_end) {
+ pr_err("initrd not found or empty");
+ goto disable;
+ }
+
+ if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
+ pr_err("initrd extends beyond end of memory");
+ goto disable;
+ }
+
+ size = initrd_end - initrd_start;
+
+ if (memblock_is_region_reserved(__pa(initrd_start), size)) {
+ pr_err("INITRD: 0x%08lx+0x%08lx overlaps in-use memory region",
+ __pa(initrd_start), size);
+ goto disable;
+ }
+
+ memblock_reserve(__pa(initrd_start), size);
+
+ pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
+ (void *)(initrd_start), size);
+
+ initrd_below_start_ok = 1;
+
+ return;
+
+disable:
+ initrd_start = initrd_end = 0;
+
+ pr_err(" - disabling initrd\n");
+}
+#endif
+
+void __init mem_init(void)
+{
+#ifdef CONFIG_HIGHMEM
+ unsigned long tmp;
+
+ set_max_mapnr(highend_pfn - ARCH_PFN_OFFSET);
+#else
+ set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
+#endif
+ high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+ setup_initrd();
+#endif
+
+ memblock_free_all();
+
+#ifdef CONFIG_HIGHMEM
+ for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
+ struct page *page = pfn_to_page(tmp);
+
+ /* FIXME not sure about */
+ if (!memblock_is_reserved(tmp << PAGE_SHIFT))
+ free_highmem_page(page);
+ }
+#endif
+}
+
+void free_initmem(void)
+{
+ free_initmem_default(-1);
+}
+
+void pgd_init(unsigned long *p)
+{
+ int i;
+
+ for (i = 0; i < PTRS_PER_PGD; i++)
+ p[i] = __pa(invalid_pte_table);
+
+ flush_tlb_all();
+ local_icache_inv_all(NULL);
+}
+
+void __init mmu_init(unsigned long min_pfn, unsigned long max_pfn)
+{
+ int i;
+
+ for (i = 0; i < USER_PTRS_PER_PGD; i++)
+ swapper_pg_dir[i].pgd = __pa(invalid_pte_table);
+
+ for (i = USER_PTRS_PER_PGD; i < PTRS_PER_PGD; i++)
+ swapper_pg_dir[i].pgd =
+ __pa(kernel_pte_tables + (PTRS_PER_PTE * (i - USER_PTRS_PER_PGD)));
+
+ for (i = 0; i < PTRS_KERN_TABLE; i++)
+ set_pte(&kernel_pte_tables[i], __pte(_PAGE_GLOBAL));
+
+ for (i = min_pfn; i < max_pfn; i++)
+ set_pte(&kernel_pte_tables[i - PFN_DOWN(va_pa_offset)], pfn_pte(i, PAGE_KERNEL));
+
+ flush_tlb_all();
+ local_icache_inv_all(NULL);
+
+ /* Setup page mask to 4k */
+ write_mmu_pagemask(0);
+
+ setup_pgd(swapper_pg_dir, 0);
+}
+
+void __init fixrange_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+ int i, j, k;
+ unsigned long vaddr;
+
+ vaddr = start;
+ i = pgd_index(vaddr);
+ j = pud_index(vaddr);
+ k = pmd_index(vaddr);
+ pgd = pgd_base + i;
+
+ for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
+ pud = (pud_t *)pgd;
+ for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
+ pmd = (pmd_t *)pud;
+ for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+ if (pmd_none(*pmd)) {
+ pte = (pte_t *) memblock_alloc_low(PAGE_SIZE, PAGE_SIZE);
+ if (!pte)
+ panic("%s: Failed to allocate %lu bytes align=%lx\n",
+ __func__, PAGE_SIZE,
+ PAGE_SIZE);
+
+ set_pmd(pmd, __pmd(__pa(pte)));
+ BUG_ON(pte != pte_offset_kernel(pmd, 0));
+ }
+ vaddr += PMD_SIZE;
+ }
+ k = 0;
+ }
+ j = 0;
+ }
+}
+
+void __init fixaddr_init(void)
+{
+ unsigned long vaddr;
+
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ fixrange_init(vaddr, vaddr + PMD_SIZE, swapper_pg_dir);
+}
+
+static const pgprot_t protection_map[16] = {
+ [VM_NONE] = PAGE_NONE,
+ [VM_READ] = PAGE_READ,
+ [VM_WRITE] = PAGE_READ,
+ [VM_WRITE | VM_READ] = PAGE_READ,
+ [VM_EXEC] = PAGE_READ,
+ [VM_EXEC | VM_READ] = PAGE_READ,
+ [VM_EXEC | VM_WRITE] = PAGE_READ,
+ [VM_EXEC | VM_WRITE | VM_READ] = PAGE_READ,
+ [VM_SHARED] = PAGE_NONE,
+ [VM_SHARED | VM_READ] = PAGE_READ,
+ [VM_SHARED | VM_WRITE] = PAGE_WRITE,
+ [VM_SHARED | VM_WRITE | VM_READ] = PAGE_WRITE,
+ [VM_SHARED | VM_EXEC] = PAGE_READ,
+ [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ,
+ [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_WRITE,
+ [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_WRITE
+};
+DECLARE_VM_GET_PAGE_PROT