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-rw-r--r--arch/sh/mm/init.c424
1 files changed, 424 insertions, 0 deletions
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
new file mode 100644
index 000000000..506784702
--- /dev/null
+++ b/arch/sh/mm/init.c
@@ -0,0 +1,424 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/arch/sh/mm/init.c
+ *
+ * Copyright (C) 1999 Niibe Yutaka
+ * Copyright (C) 2002 - 2011 Paul Mundt
+ *
+ * Based on linux/arch/i386/mm/init.c:
+ * Copyright (C) 1995 Linus Torvalds
+ */
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/init.h>
+#include <linux/gfp.h>
+#include <linux/memblock.h>
+#include <linux/proc_fs.h>
+#include <linux/pagemap.h>
+#include <linux/percpu.h>
+#include <linux/io.h>
+#include <linux/dma-mapping.h>
+#include <linux/export.h>
+#include <asm/mmu_context.h>
+#include <asm/mmzone.h>
+#include <asm/kexec.h>
+#include <asm/tlb.h>
+#include <asm/cacheflush.h>
+#include <asm/sections.h>
+#include <asm/setup.h>
+#include <asm/cache.h>
+#include <asm/pgalloc.h>
+#include <linux/sizes.h>
+#include "ioremap.h"
+
+pgd_t swapper_pg_dir[PTRS_PER_PGD];
+
+void __init generic_mem_init(void)
+{
+ memblock_add(__MEMORY_START, __MEMORY_SIZE);
+}
+
+void __init __weak plat_mem_setup(void)
+{
+ /* Nothing to see here, move along. */
+}
+
+#ifdef CONFIG_MMU
+static pte_t *__get_pte_phys(unsigned long addr)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+
+ pgd = pgd_offset_k(addr);
+ if (pgd_none(*pgd)) {
+ pgd_ERROR(*pgd);
+ return NULL;
+ }
+
+ p4d = p4d_alloc(NULL, pgd, addr);
+ if (unlikely(!p4d)) {
+ p4d_ERROR(*p4d);
+ return NULL;
+ }
+
+ pud = pud_alloc(NULL, p4d, addr);
+ if (unlikely(!pud)) {
+ pud_ERROR(*pud);
+ return NULL;
+ }
+
+ pmd = pmd_alloc(NULL, pud, addr);
+ if (unlikely(!pmd)) {
+ pmd_ERROR(*pmd);
+ return NULL;
+ }
+
+ return pte_offset_kernel(pmd, addr);
+}
+
+static void set_pte_phys(unsigned long addr, unsigned long phys, pgprot_t prot)
+{
+ pte_t *pte;
+
+ pte = __get_pte_phys(addr);
+ if (!pte_none(*pte)) {
+ pte_ERROR(*pte);
+ return;
+ }
+
+ set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, prot));
+ local_flush_tlb_one(get_asid(), addr);
+
+ if (pgprot_val(prot) & _PAGE_WIRED)
+ tlb_wire_entry(NULL, addr, *pte);
+}
+
+static void clear_pte_phys(unsigned long addr, pgprot_t prot)
+{
+ pte_t *pte;
+
+ pte = __get_pte_phys(addr);
+
+ if (pgprot_val(prot) & _PAGE_WIRED)
+ tlb_unwire_entry();
+
+ set_pte(pte, pfn_pte(0, __pgprot(0)));
+ local_flush_tlb_one(get_asid(), addr);
+}
+
+void __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
+{
+ unsigned long address = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+
+ set_pte_phys(address, phys, prot);
+}
+
+void __clear_fixmap(enum fixed_addresses idx, pgprot_t prot)
+{
+ unsigned long address = __fix_to_virt(idx);
+
+ if (idx >= __end_of_fixed_addresses) {
+ BUG();
+ return;
+ }
+
+ clear_pte_phys(address, prot);
+}
+
+static pmd_t * __init one_md_table_init(pud_t *pud)
+{
+ if (pud_none(*pud)) {
+ pmd_t *pmd;
+
+ pmd = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ if (!pmd)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+ __func__, PAGE_SIZE, PAGE_SIZE);
+ pud_populate(&init_mm, pud, pmd);
+ BUG_ON(pmd != pmd_offset(pud, 0));
+ }
+
+ return pmd_offset(pud, 0);
+}
+
+static pte_t * __init one_page_table_init(pmd_t *pmd)
+{
+ if (pmd_none(*pmd)) {
+ pte_t *pte;
+
+ pte = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ if (!pte)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+ __func__, PAGE_SIZE, PAGE_SIZE);
+ pmd_populate_kernel(&init_mm, pmd, pte);
+ BUG_ON(pte != pte_offset_kernel(pmd, 0));
+ }
+
+ return pte_offset_kernel(pmd, 0);
+}
+
+static pte_t * __init page_table_kmap_check(pte_t *pte, pmd_t *pmd,
+ unsigned long vaddr, pte_t *lastpte)
+{
+ return pte;
+}
+
+void __init page_table_range_init(unsigned long start, unsigned long end,
+ pgd_t *pgd_base)
+{
+ pgd_t *pgd;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte = NULL;
+ 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 = one_md_table_init(pud);
+#ifndef __PAGETABLE_PMD_FOLDED
+ pmd += k;
+#endif
+ for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
+ pte = page_table_kmap_check(one_page_table_init(pmd),
+ pmd, vaddr, pte);
+ vaddr += PMD_SIZE;
+ }
+ k = 0;
+ }
+ j = 0;
+ }
+}
+#endif /* CONFIG_MMU */
+
+void __init allocate_pgdat(unsigned int nid)
+{
+ unsigned long start_pfn, end_pfn;
+
+ get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
+
+#ifdef CONFIG_NUMA
+ NODE_DATA(nid) = memblock_alloc_try_nid(
+ sizeof(struct pglist_data),
+ SMP_CACHE_BYTES, MEMBLOCK_LOW_LIMIT,
+ MEMBLOCK_ALLOC_ACCESSIBLE, nid);
+ if (!NODE_DATA(nid))
+ panic("Can't allocate pgdat for node %d\n", nid);
+#endif
+
+ NODE_DATA(nid)->node_start_pfn = start_pfn;
+ NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
+}
+
+static void __init do_init_bootmem(void)
+{
+ unsigned long start_pfn, end_pfn;
+ int i;
+
+ /* Add active regions with valid PFNs. */
+ for_each_mem_pfn_range(i, MAX_NUMNODES, &start_pfn, &end_pfn, NULL)
+ __add_active_range(0, start_pfn, end_pfn);
+
+ /* All of system RAM sits in node 0 for the non-NUMA case */
+ allocate_pgdat(0);
+ node_set_online(0);
+
+ plat_mem_setup();
+
+ sparse_init();
+}
+
+static void __init early_reserve_mem(void)
+{
+ unsigned long start_pfn;
+ u32 zero_base = (u32)__MEMORY_START + (u32)PHYSICAL_OFFSET;
+ u32 start = zero_base + (u32)CONFIG_ZERO_PAGE_OFFSET;
+
+ /*
+ * Partially used pages are not usable - thus
+ * we are rounding upwards:
+ */
+ start_pfn = PFN_UP(__pa(_end));
+
+ /*
+ * Reserve the kernel text and Reserve the bootmem bitmap. We do
+ * this in two steps (first step was init_bootmem()), because
+ * this catches the (definitely buggy) case of us accidentally
+ * initializing the bootmem allocator with an invalid RAM area.
+ */
+ memblock_reserve(start, (PFN_PHYS(start_pfn) + PAGE_SIZE - 1) - start);
+
+ /*
+ * Reserve physical pages below CONFIG_ZERO_PAGE_OFFSET.
+ */
+ if (CONFIG_ZERO_PAGE_OFFSET != 0)
+ memblock_reserve(zero_base, CONFIG_ZERO_PAGE_OFFSET);
+
+ /*
+ * Handle additional early reservations
+ */
+ check_for_initrd();
+ reserve_crashkernel();
+}
+
+void __init paging_init(void)
+{
+ unsigned long max_zone_pfns[MAX_NR_ZONES];
+ unsigned long vaddr, end;
+
+ sh_mv.mv_mem_init();
+
+ early_reserve_mem();
+
+ /*
+ * Once the early reservations are out of the way, give the
+ * platforms a chance to kick out some memory.
+ */
+ if (sh_mv.mv_mem_reserve)
+ sh_mv.mv_mem_reserve();
+
+ memblock_enforce_memory_limit(memory_limit);
+ memblock_allow_resize();
+
+ memblock_dump_all();
+
+ /*
+ * Determine low and high memory ranges:
+ */
+ max_low_pfn = max_pfn = memblock_end_of_DRAM() >> PAGE_SHIFT;
+ min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
+
+ nodes_clear(node_online_map);
+
+ memory_start = (unsigned long)__va(__MEMORY_START);
+ memory_end = memory_start + (memory_limit ?: memblock_phys_mem_size());
+
+ uncached_init();
+ pmb_init();
+ do_init_bootmem();
+ ioremap_fixed_init();
+
+ /* We don't need to map the kernel through the TLB, as
+ * it is permanatly mapped using P1. So clear the
+ * entire pgd. */
+ memset(swapper_pg_dir, 0, sizeof(swapper_pg_dir));
+
+ /* Set an initial value for the MMU.TTB so we don't have to
+ * check for a null value. */
+ set_TTB(swapper_pg_dir);
+
+ /*
+ * Populate the relevant portions of swapper_pg_dir so that
+ * we can use the fixmap entries without calling kmalloc.
+ * pte's will be filled in by __set_fixmap().
+ */
+ vaddr = __fix_to_virt(__end_of_fixed_addresses - 1) & PMD_MASK;
+ end = (FIXADDR_TOP + PMD_SIZE - 1) & PMD_MASK;
+ page_table_range_init(vaddr, end, swapper_pg_dir);
+
+ kmap_coherent_init();
+
+ memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
+ max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
+ free_area_init(max_zone_pfns);
+}
+
+unsigned int mem_init_done = 0;
+
+void __init mem_init(void)
+{
+ pg_data_t *pgdat;
+
+ high_memory = NULL;
+ for_each_online_pgdat(pgdat)
+ high_memory = max_t(void *, high_memory,
+ __va(pgdat_end_pfn(pgdat) << PAGE_SHIFT));
+
+ memblock_free_all();
+
+ /* Set this up early, so we can take care of the zero page */
+ cpu_cache_init();
+
+ /* clear the zero-page */
+ memset(empty_zero_page, 0, PAGE_SIZE);
+ __flush_wback_region(empty_zero_page, PAGE_SIZE);
+
+ vsyscall_init();
+
+ pr_info("virtual kernel memory layout:\n"
+ " fixmap : 0x%08lx - 0x%08lx (%4ld kB)\n"
+ " vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
+ " lowmem : 0x%08lx - 0x%08lx (%4ld MB) (cached)\n"
+#ifdef CONFIG_UNCACHED_MAPPING
+ " : 0x%08lx - 0x%08lx (%4ld MB) (uncached)\n"
+#endif
+ " .init : 0x%08lx - 0x%08lx (%4ld kB)\n"
+ " .data : 0x%08lx - 0x%08lx (%4ld kB)\n"
+ " .text : 0x%08lx - 0x%08lx (%4ld kB)\n",
+ FIXADDR_START, FIXADDR_TOP,
+ (FIXADDR_TOP - FIXADDR_START) >> 10,
+
+ (unsigned long)VMALLOC_START, VMALLOC_END,
+ (VMALLOC_END - VMALLOC_START) >> 20,
+
+ (unsigned long)memory_start, (unsigned long)high_memory,
+ ((unsigned long)high_memory - (unsigned long)memory_start) >> 20,
+
+#ifdef CONFIG_UNCACHED_MAPPING
+ uncached_start, uncached_end, uncached_size >> 20,
+#endif
+
+ (unsigned long)&__init_begin, (unsigned long)&__init_end,
+ ((unsigned long)&__init_end -
+ (unsigned long)&__init_begin) >> 10,
+
+ (unsigned long)&_etext, (unsigned long)&_edata,
+ ((unsigned long)&_edata - (unsigned long)&_etext) >> 10,
+
+ (unsigned long)&_text, (unsigned long)&_etext,
+ ((unsigned long)&_etext - (unsigned long)&_text) >> 10);
+
+ mem_init_done = 1;
+}
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+int arch_add_memory(int nid, u64 start, u64 size,
+ struct mhp_params *params)
+{
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+ int ret;
+
+ if (WARN_ON_ONCE(params->pgprot.pgprot != PAGE_KERNEL.pgprot))
+ return -EINVAL;
+
+ /* We only have ZONE_NORMAL, so this is easy.. */
+ ret = __add_pages(nid, start_pfn, nr_pages, params);
+ if (unlikely(ret))
+ printk("%s: Failed, __add_pages() == %d\n", __func__, ret);
+
+ return ret;
+}
+
+void arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap)
+{
+ unsigned long start_pfn = PFN_DOWN(start);
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ __remove_pages(start_pfn, nr_pages, altmap);
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
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