[thirdparty/linux.git] / arch / riscv / mm / init.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (C) 2012 Regents of the University of California
 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
 */

#include <linux/init.h>
#include <linux/mm.h>
#include <linux/memblock.h>
#include <linux/initrd.h>
#include <linux/swap.h>
#include <linux/sizes.h>
#include <linux/of_fdt.h>
#include <linux/libfdt.h>
#include <linux/set_memory.h>

#include <asm/fixmap.h>
#include <asm/tlbflush.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/io.h>

#include "../kernel/head.h"

unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
							__page_aligned_bss;
EXPORT_SYMBOL(empty_zero_page);

extern char _start[];
void *dtb_early_va;

static void __init zone_sizes_init(void)
{
	unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };

#ifdef CONFIG_ZONE_DMA32
	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
			(unsigned long) PFN_PHYS(max_low_pfn)));
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;

	free_area_init_nodes(max_zone_pfns);
}

static void setup_zero_page(void)
{
	memset((void *)empty_zero_page, 0, PAGE_SIZE);
}

#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
static inline void print_mlk(char *name, unsigned long b, unsigned long t)
{
	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld kB)\n", name, b, t,
		  (((t) - (b)) >> 10));
}

static inline void print_mlm(char *name, unsigned long b, unsigned long t)
{
	pr_notice("%12s : 0x%08lx - 0x%08lx   (%4ld MB)\n", name, b, t,
		  (((t) - (b)) >> 20));
}

static void print_vm_layout(void)
{
	pr_notice("Virtual kernel memory layout:\n");
	print_mlk("fixmap", (unsigned long)FIXADDR_START,
		  (unsigned long)FIXADDR_TOP);
	print_mlm("pci io", (unsigned long)PCI_IO_START,
		  (unsigned long)PCI_IO_END);
	print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
		  (unsigned long)VMEMMAP_END);
	print_mlm("vmalloc", (unsigned long)VMALLOC_START,
		  (unsigned long)VMALLOC_END);
	print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
		  (unsigned long)high_memory);
}
#else
static void print_vm_layout(void) { }
#endif /* CONFIG_DEBUG_VM */

void __init mem_init(void)
{
#ifdef CONFIG_FLATMEM
	BUG_ON(!mem_map);
#endif /* CONFIG_FLATMEM */

	high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
	memblock_free_all();

	mem_init_print_info(NULL);
	print_vm_layout();
}

#ifdef CONFIG_BLK_DEV_INITRD
static void __init setup_initrd(void)
{
	unsigned long size;

	if (initrd_start >= initrd_end) {
		pr_info("initrd not found or empty");
		goto disable;
	}
	if (__pa_symbol(initrd_end) > PFN_PHYS(max_low_pfn)) {
		pr_err("initrd extends beyond end of memory");
		goto disable;
	}

	size = initrd_end - initrd_start;
	memblock_reserve(__pa_symbol(initrd_start), size);
	initrd_below_start_ok = 1;

	pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
		(void *)(initrd_start), size);
	return;
disable:
	pr_cont(" - disabling initrd\n");
	initrd_start = 0;
	initrd_end = 0;
}
#endif /* CONFIG_BLK_DEV_INITRD */

static phys_addr_t dtb_early_pa __initdata;

void __init setup_bootmem(void)
{
	struct memblock_region *reg;
	phys_addr_t mem_size = 0;
	phys_addr_t vmlinux_end = __pa_symbol(&_end);
	phys_addr_t vmlinux_start = __pa_symbol(&_start);

	/* Find the memory region containing the kernel */
	for_each_memblock(memory, reg) {
		phys_addr_t end = reg->base + reg->size;

		if (reg->base <= vmlinux_start && vmlinux_end <= end) {
			mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);

			/*
			 * Remove memblock from the end of usable area to the
			 * end of region
			 */
			if (reg->base + mem_size < end)
				memblock_remove(reg->base + mem_size,
						end - reg->base - mem_size);
		}
	}
	BUG_ON(mem_size == 0);

	/* Reserve from the start of the kernel to the end of the kernel */
	memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);

	set_max_mapnr(PFN_DOWN(mem_size));
	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
	max_low_pfn = max_pfn;

#ifdef CONFIG_BLK_DEV_INITRD
	setup_initrd();
#endif /* CONFIG_BLK_DEV_INITRD */

	/*
	 * Avoid using early_init_fdt_reserve_self() since __pa() does
	 * not work for DTB pointers that are fixmap addresses
	 */
	memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));

	early_init_fdt_scan_reserved_mem();
	memblock_allow_resize();
	memblock_dump_all();

	for_each_memblock(memory, reg) {
		unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
		unsigned long end_pfn = memblock_region_memory_end_pfn(reg);

		memblock_set_node(PFN_PHYS(start_pfn),
				  PFN_PHYS(end_pfn - start_pfn),
				  &memblock.memory, 0);
	}
}

#ifdef CONFIG_MMU
unsigned long va_pa_offset;
EXPORT_SYMBOL(va_pa_offset);
unsigned long pfn_base;
EXPORT_SYMBOL(pfn_base);

pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
static bool mmu_enabled;

#define MAX_EARLY_MAPPING_SIZE	SZ_128M

pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);

void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
{
	unsigned long addr = __fix_to_virt(idx);
	pte_t *ptep;

	BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);

	ptep = &fixmap_pte[pte_index(addr)];

	if (pgprot_val(prot)) {
		set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
	} else {
		pte_clear(&init_mm, addr, ptep);
		local_flush_tlb_page(addr);
	}
}

static pte_t *__init get_pte_virt(phys_addr_t pa)
{
	if (mmu_enabled) {
		clear_fixmap(FIX_PTE);
		return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
	} else {
		return (pte_t *)((uintptr_t)pa);
	}
}

static phys_addr_t __init alloc_pte(uintptr_t va)
{
	/*
	 * We only create PMD or PGD early mappings so we
	 * should never reach here with MMU disabled.
	 */
	BUG_ON(!mmu_enabled);

	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
}

static void __init create_pte_mapping(pte_t *ptep,
				      uintptr_t va, phys_addr_t pa,
				      phys_addr_t sz, pgprot_t prot)
{
	uintptr_t pte_index = pte_index(va);

	BUG_ON(sz != PAGE_SIZE);

	if (pte_none(ptep[pte_index]))
		ptep[pte_index] = pfn_pte(PFN_DOWN(pa), prot);
}

#ifndef __PAGETABLE_PMD_FOLDED

pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;

#if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
#define NUM_EARLY_PMDS		1UL
#else
#define NUM_EARLY_PMDS		(1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
#endif
pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);

static pmd_t *__init get_pmd_virt(phys_addr_t pa)
{
	if (mmu_enabled) {
		clear_fixmap(FIX_PMD);
		return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
	} else {
		return (pmd_t *)((uintptr_t)pa);
	}
}

static phys_addr_t __init alloc_pmd(uintptr_t va)
{
	uintptr_t pmd_num;

	if (mmu_enabled)
		return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);

	pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
	BUG_ON(pmd_num >= NUM_EARLY_PMDS);
	return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
}

static void __init create_pmd_mapping(pmd_t *pmdp,
				      uintptr_t va, phys_addr_t pa,
				      phys_addr_t sz, pgprot_t prot)
{
	pte_t *ptep;
	phys_addr_t pte_phys;
	uintptr_t pmd_index = pmd_index(va);

	if (sz == PMD_SIZE) {
		if (pmd_none(pmdp[pmd_index]))
			pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pa), prot);
		return;
	}

	if (pmd_none(pmdp[pmd_index])) {
		pte_phys = alloc_pte(va);
		pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
		ptep = get_pte_virt(pte_phys);
		memset(ptep, 0, PAGE_SIZE);
	} else {
		pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_index]));
		ptep = get_pte_virt(pte_phys);
	}

	create_pte_mapping(ptep, va, pa, sz, prot);
}

#define pgd_next_t		pmd_t
#define alloc_pgd_next(__va)	alloc_pmd(__va)
#define get_pgd_next_virt(__pa)	get_pmd_virt(__pa)
#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)	\
	create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
#define fixmap_pgd_next		fixmap_pmd
#else
#define pgd_next_t		pte_t
#define alloc_pgd_next(__va)	alloc_pte(__va)
#define get_pgd_next_virt(__pa)	get_pte_virt(__pa)
#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot)	\
	create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
#define fixmap_pgd_next		fixmap_pte
#endif

static void __init create_pgd_mapping(pgd_t *pgdp,
				      uintptr_t va, phys_addr_t pa,
				      phys_addr_t sz, pgprot_t prot)
{
	pgd_next_t *nextp;
	phys_addr_t next_phys;
	uintptr_t pgd_index = pgd_index(va);

	if (sz == PGDIR_SIZE) {
		if (pgd_val(pgdp[pgd_index]) == 0)
			pgdp[pgd_index] = pfn_pgd(PFN_DOWN(pa), prot);
		return;
	}

	if (pgd_val(pgdp[pgd_index]) == 0) {
		next_phys = alloc_pgd_next(va);
		pgdp[pgd_index] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
		nextp = get_pgd_next_virt(next_phys);
		memset(nextp, 0, PAGE_SIZE);
	} else {
		next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_index]));
		nextp = get_pgd_next_virt(next_phys);
	}

	create_pgd_next_mapping(nextp, va, pa, sz, prot);
}

static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
{
	/* Upgrade to PMD_SIZE mappings whenever possible */
	if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
		return PAGE_SIZE;

	return PMD_SIZE;
}

/*
 * setup_vm() is called from head.S with MMU-off.
 *
 * Following requirements should be honoured for setup_vm() to work
 * correctly:
 * 1) It should use PC-relative addressing for accessing kernel symbols.
 *    To achieve this we always use GCC cmodel=medany.
 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
 *    so disable compiler instrumentation when FTRACE is enabled.
 *
 * Currently, the above requirements are honoured by using custom CFLAGS
 * for init.o in mm/Makefile.
 */

#ifndef __riscv_cmodel_medany
#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
#endif

asmlinkage void __init setup_vm(uintptr_t dtb_pa)
{
	uintptr_t va, end_va;
	uintptr_t load_pa = (uintptr_t)(&_start);
	uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
	uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);

	va_pa_offset = PAGE_OFFSET - load_pa;
	pfn_base = PFN_DOWN(load_pa);

	/*
	 * Enforce boot alignment requirements of RV32 and
	 * RV64 by only allowing PMD or PGD mappings.
	 */
	BUG_ON(map_size == PAGE_SIZE);

	/* Sanity check alignment and size */
	BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
	BUG_ON((load_pa % map_size) != 0);
	BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);

	/* Setup early PGD for fixmap */
	create_pgd_mapping(early_pg_dir, FIXADDR_START,
			   (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);

#ifndef __PAGETABLE_PMD_FOLDED
	/* Setup fixmap PMD */
	create_pmd_mapping(fixmap_pmd, FIXADDR_START,
			   (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
	/* Setup trampoline PGD and PMD */
	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
			   (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
	create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
			   load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
#else
	/* Setup trampoline PGD */
	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
			   load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
#endif

	/*
	 * Setup early PGD covering entire kernel which will allows
	 * us to reach paging_init(). We map all memory banks later
	 * in setup_vm_final() below.
	 */
	end_va = PAGE_OFFSET + load_sz;
	for (va = PAGE_OFFSET; va < end_va; va += map_size)
		create_pgd_mapping(early_pg_dir, va,
				   load_pa + (va - PAGE_OFFSET),
				   map_size, PAGE_KERNEL_EXEC);

	/* Create fixed mapping for early FDT parsing */
	end_va = __fix_to_virt(FIX_FDT) + FIX_FDT_SIZE;
	for (va = __fix_to_virt(FIX_FDT); va < end_va; va += PAGE_SIZE)
		create_pte_mapping(fixmap_pte, va,
				   dtb_pa + (va - __fix_to_virt(FIX_FDT)),
				   PAGE_SIZE, PAGE_KERNEL);

	/* Save pointer to DTB for early FDT parsing */
	dtb_early_va = (void *)fix_to_virt(FIX_FDT) + (dtb_pa & ~PAGE_MASK);
	/* Save physical address for memblock reservation */
	dtb_early_pa = dtb_pa;
}

static void __init setup_vm_final(void)
{
	uintptr_t va, map_size;
	phys_addr_t pa, start, end;
	struct memblock_region *reg;

	/* Set mmu_enabled flag */
	mmu_enabled = true;

	/* Setup swapper PGD for fixmap */
	create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
			   __pa_symbol(fixmap_pgd_next),
			   PGDIR_SIZE, PAGE_TABLE);

	/* Map all memory banks */
	for_each_memblock(memory, reg) {
		start = reg->base;
		end = start + reg->size;

		if (start >= end)
			break;
		if (memblock_is_nomap(reg))
			continue;
		if (start <= __pa(PAGE_OFFSET) &&
		    __pa(PAGE_OFFSET) < end)
			start = __pa(PAGE_OFFSET);

		map_size = best_map_size(start, end - start);
		for (pa = start; pa < end; pa += map_size) {
			va = (uintptr_t)__va(pa);
			create_pgd_mapping(swapper_pg_dir, va, pa,
					   map_size, PAGE_KERNEL_EXEC);
		}
	}

	/* Clear fixmap PTE and PMD mappings */
	clear_fixmap(FIX_PTE);
	clear_fixmap(FIX_PMD);

	/* Move to swapper page table */
	csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
	local_flush_tlb_all();
}

void free_initmem(void)
{
	unsigned long init_begin = (unsigned long)__init_begin;
	unsigned long init_end = (unsigned long)__init_end;

	/* Make the region as non-execuatble. */
	set_memory_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT);
	free_initmem_default(POISON_FREE_INITMEM);
}

#else
asmlinkage void __init setup_vm(uintptr_t dtb_pa)
{
	dtb_early_va = (void *)dtb_pa;
}

static inline void setup_vm_final(void)
{
}
#endif /* CONFIG_MMU */

#ifdef CONFIG_STRICT_KERNEL_RWX
void mark_rodata_ro(void)
{
	unsigned long text_start = (unsigned long)_text;
	unsigned long text_end = (unsigned long)_etext;
	unsigned long rodata_start = (unsigned long)__start_rodata;
	unsigned long data_start = (unsigned long)_data;
	unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));

	set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
	set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
	set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
	set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
}
#endif

void __init paging_init(void)
{
	setup_vm_final();
	memblocks_present();
	sparse_init();
	setup_zero_page();
	zone_sizes_init();
}

#ifdef CONFIG_SPARSEMEM_VMEMMAP
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
			       struct vmem_altmap *altmap)
{
	return vmemmap_populate_basepages(start, end, node);
}
#endif
Commit	Line	Data
50acfb2b	1	// SPDX-License-Identifier: GPL-2.0-only
76d2a049 PD	2	/*
76d2a049 PD	3	* Copyright (C) 2012 Regents of the University of California
671f9a3e	4	* Copyright (C) 2019 Western Digital Corporation or its affiliates.
76d2a049 PD	5	*/
	6
	7	#include <linux/init.h>
	8	#include <linux/mm.h>
76d2a049	9	#include <linux/memblock.h>
57c8a661	10	#include <linux/initrd.h>
76d2a049	11	#include <linux/swap.h>
5ec9c4ff	12	#include <linux/sizes.h>
0651c263	13	#include <linux/of_fdt.h>
922b0375	14	#include <linux/libfdt.h>
d27c3c90	15	#include <linux/set_memory.h>
76d2a049	16
f2c17aab	17	#include <asm/fixmap.h>
76d2a049 PD	18	#include <asm/tlbflush.h>
	19	#include <asm/sections.h>
	20	#include <asm/pgtable.h>
	21	#include <asm/io.h>
	22
ffaee272 PW	23	#include "../kernel/head.h"
ffaee272 PW	24
387181dc AP	25	unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
	26	__page_aligned_bss;
	27	EXPORT_SYMBOL(empty_zero_page);
	28
d90d45d7	29	extern char _start[];
6bd33e1e	30	void *dtb_early_va;
d90d45d7	31
76d2a049 PD	32	static void __init zone_sizes_init(void)
76d2a049 PD	33	{
5ec9c4ff	34	unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
76d2a049	35
d5fad48c	36	#ifdef CONFIG_ZONE_DMA32
28198c46 GR	37	max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G,
28198c46 GR	38	(unsigned long) PFN_PHYS(max_low_pfn)));
d5fad48c	39	#endif
5ec9c4ff CH	40	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	41
	42	free_area_init_nodes(max_zone_pfns);
76d2a049 PD	43	}
76d2a049 PD	44
6bd33e1e	45	static void setup_zero_page(void)
76d2a049 PD	46	{
	47	memset((void *)empty_zero_page, 0, PAGE_SIZE);
	48	}
	49
8fa3cdff	50	#if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
2cc6c4a0 YS	51	static inline void print_mlk(char *name, unsigned long b, unsigned long t)
	52	{
	53	pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
	54	(((t) - (b)) >> 10));
	55	}
	56
	57	static inline void print_mlm(char *name, unsigned long b, unsigned long t)
	58	{
	59	pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
	60	(((t) - (b)) >> 20));
	61	}
	62
	63	static void print_vm_layout(void)
	64	{
	65	pr_notice("Virtual kernel memory layout:\n");
	66	print_mlk("fixmap", (unsigned long)FIXADDR_START,
	67	(unsigned long)FIXADDR_TOP);
	68	print_mlm("pci io", (unsigned long)PCI_IO_START,
	69	(unsigned long)PCI_IO_END);
	70	print_mlm("vmemmap", (unsigned long)VMEMMAP_START,
	71	(unsigned long)VMEMMAP_END);
	72	print_mlm("vmalloc", (unsigned long)VMALLOC_START,
	73	(unsigned long)VMALLOC_END);
	74	print_mlm("lowmem", (unsigned long)PAGE_OFFSET,
	75	(unsigned long)high_memory);
	76	}
	77	#else
	78	static void print_vm_layout(void) { }
	79	#endif /* CONFIG_DEBUG_VM */
	80
76d2a049 PD	81	void __init mem_init(void)
	82	{
	83	#ifdef CONFIG_FLATMEM
	84	BUG_ON(!mem_map);
	85	#endif /* CONFIG_FLATMEM */
	86
	87	high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
c6ffc5ca	88	memblock_free_all();
76d2a049 PD	89
76d2a049 PD	90	mem_init_print_info(NULL);
2cc6c4a0	91	print_vm_layout();
76d2a049 PD	92	}
76d2a049 PD	93
76d2a049	94	#ifdef CONFIG_BLK_DEV_INITRD
0651c263 AP	95	static void __init setup_initrd(void)
	96	{
	97	unsigned long size;
	98
	99	if (initrd_start >= initrd_end) {
	100	pr_info("initrd not found or empty");
	101	goto disable;
	102	}
ac51e005	103	if (__pa_symbol(initrd_end) > PFN_PHYS(max_low_pfn)) {
0651c263 AP	104	pr_err("initrd extends beyond end of memory");
	105	goto disable;
	106	}
	107
	108	size = initrd_end - initrd_start;
ac51e005	109	memblock_reserve(__pa_symbol(initrd_start), size);
0651c263 AP	110	initrd_below_start_ok = 1;
	111
	112	pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n",
	113	(void *)(initrd_start), size);
	114	return;
	115	disable:
	116	pr_cont(" - disabling initrd\n");
	117	initrd_start = 0;
	118	initrd_end = 0;
	119	}
76d2a049	120	#endif /* CONFIG_BLK_DEV_INITRD */
0651c263	121
922b0375 AO	122	static phys_addr_t dtb_early_pa __initdata;
922b0375 AO	123
0651c263 AP	124	void __init setup_bootmem(void)
	125	{
	126	struct memblock_region *reg;
	127	phys_addr_t mem_size = 0;
ac51e005 ZL	128	phys_addr_t vmlinux_end = __pa_symbol(&_end);
ac51e005 ZL	129	phys_addr_t vmlinux_start = __pa_symbol(&_start);
0651c263 AP	130
	131	/* Find the memory region containing the kernel */
	132	for_each_memblock(memory, reg) {
0651c263 AP	133	phys_addr_t end = reg->base + reg->size;
0651c263 AP	134
a160eed4	135	if (reg->base <= vmlinux_start && vmlinux_end <= end) {
0651c263	136	mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET);
f05badde AP	137
	138	/*
	139	* Remove memblock from the end of usable area to the
	140	* end of region
	141	*/
	142	if (reg->base + mem_size < end)
	143	memblock_remove(reg->base + mem_size,
	144	end - reg->base - mem_size);
0651c263 AP	145	}
	146	}
	147	BUG_ON(mem_size == 0);
	148
d90d45d7 AP	149	/* Reserve from the start of the kernel to the end of the kernel */
	150	memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
	151
0651c263	152	set_max_mapnr(PFN_DOWN(mem_size));
c749bb2d VC	153	max_pfn = PFN_DOWN(memblock_end_of_DRAM());
c749bb2d VC	154	max_low_pfn = max_pfn;
0651c263 AP	155
	156	#ifdef CONFIG_BLK_DEV_INITRD
	157	setup_initrd();
	158	#endif /* CONFIG_BLK_DEV_INITRD */
	159
922b0375 AO	160	/*
	161	* Avoid using early_init_fdt_reserve_self() since __pa() does
	162	* not work for DTB pointers that are fixmap addresses
	163	*/
	164	memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
	165
0651c263 AP	166	early_init_fdt_scan_reserved_mem();
	167	memblock_allow_resize();
	168	memblock_dump_all();
	169
	170	for_each_memblock(memory, reg) {
	171	unsigned long start_pfn = memblock_region_memory_base_pfn(reg);
	172	unsigned long end_pfn = memblock_region_memory_end_pfn(reg);
	173
	174	memblock_set_node(PFN_PHYS(start_pfn),
	175	PFN_PHYS(end_pfn - start_pfn),
	176	&memblock.memory, 0);
	177	}
	178	}
6f1e9e94	179
6bd33e1e	180	#ifdef CONFIG_MMU
387181dc AP	181	unsigned long va_pa_offset;
	182	EXPORT_SYMBOL(va_pa_offset);
	183	unsigned long pfn_base;
	184	EXPORT_SYMBOL(pfn_base);
	185
6f1e9e94	186	pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
671f9a3e AP	187	pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
	188	pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
	189	static bool mmu_enabled;
6f1e9e94	190
671f9a3e	191	#define MAX_EARLY_MAPPING_SIZE SZ_128M
6f1e9e94	192
671f9a3e	193	pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
f2c17aab AP	194
	195	void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
	196	{
	197	unsigned long addr = __fix_to_virt(idx);
	198	pte_t *ptep;
	199
	200	BUG_ON(idx <= FIX_HOLE \|\| idx >= __end_of_fixed_addresses);
	201
	202	ptep = &fixmap_pte[pte_index(addr)];
	203
	204	if (pgprot_val(prot)) {
	205	set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
	206	} else {
	207	pte_clear(&init_mm, addr, ptep);
	208	local_flush_tlb_page(addr);
	209	}
	210	}
	211
671f9a3e AP	212	static pte_t *__init get_pte_virt(phys_addr_t pa)
	213	{
	214	if (mmu_enabled) {
	215	clear_fixmap(FIX_PTE);
	216	return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
	217	} else {
	218	return (pte_t *)((uintptr_t)pa);
	219	}
	220	}
	221
	222	static phys_addr_t __init alloc_pte(uintptr_t va)
	223	{
	224	/*
	225	* We only create PMD or PGD early mappings so we
	226	* should never reach here with MMU disabled.
	227	*/
	228	BUG_ON(!mmu_enabled);
	229
	230	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
	231	}
	232
	233	static void __init create_pte_mapping(pte_t *ptep,
	234	uintptr_t va, phys_addr_t pa,
	235	phys_addr_t sz, pgprot_t prot)
	236	{
	237	uintptr_t pte_index = pte_index(va);
	238
	239	BUG_ON(sz != PAGE_SIZE);
	240
	241	if (pte_none(ptep[pte_index]))
	242	ptep[pte_index] = pfn_pte(PFN_DOWN(pa), prot);
	243	}
	244
	245	#ifndef __PAGETABLE_PMD_FOLDED
	246
	247	pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
	248	pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
	249
	250	#if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE
	251	#define NUM_EARLY_PMDS 1UL
	252	#else
	253	#define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE)
	254	#endif
	255	pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE);
	256
	257	static pmd_t *__init get_pmd_virt(phys_addr_t pa)
	258	{
	259	if (mmu_enabled) {
	260	clear_fixmap(FIX_PMD);
	261	return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
	262	} else {
	263	return (pmd_t *)((uintptr_t)pa);
	264	}
	265	}
	266
	267	static phys_addr_t __init alloc_pmd(uintptr_t va)
	268	{
	269	uintptr_t pmd_num;
	270
	271	if (mmu_enabled)
	272	return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
	273
	274	pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT;
	275	BUG_ON(pmd_num >= NUM_EARLY_PMDS);
276	return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD];
277	}
278
279	static void __init create_pmd_mapping(pmd_t *pmdp,
280	uintptr_t va, phys_addr_t pa,
281	phys_addr_t sz, pgprot_t prot)
282	{
283	pte_t *ptep;
284	phys_addr_t pte_phys;
285	uintptr_t pmd_index = pmd_index(va);
286
287	if (sz == PMD_SIZE) {
288	if (pmd_none(pmdp[pmd_index]))
289	pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pa), prot);
290	return;
291	}
292
293	if (pmd_none(pmdp[pmd_index])) {
294	pte_phys = alloc_pte(va);
295	pmdp[pmd_index] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
296	ptep = get_pte_virt(pte_phys);
297	memset(ptep, 0, PAGE_SIZE);
298	} else {
299	pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_index]));
300	ptep = get_pte_virt(pte_phys);
301	}
302
303	create_pte_mapping(ptep, va, pa, sz, prot);
304	}
305
306	#define pgd_next_t pmd_t
307	#define alloc_pgd_next(__va) alloc_pmd(__va)
308	#define get_pgd_next_virt(__pa) get_pmd_virt(__pa)
309	#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
310	create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
671f9a3e AP	311	#define fixmap_pgd_next fixmap_pmd
	312	#else
	313	#define pgd_next_t pte_t
	314	#define alloc_pgd_next(__va) alloc_pte(__va)
	315	#define get_pgd_next_virt(__pa) get_pte_virt(__pa)
	316	#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
	317	create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
671f9a3e AP	318	#define fixmap_pgd_next fixmap_pte
	319	#endif
	320
	321	static void __init create_pgd_mapping(pgd_t *pgdp,
	322	uintptr_t va, phys_addr_t pa,
	323	phys_addr_t sz, pgprot_t prot)
	324	{
	325	pgd_next_t *nextp;
	326	phys_addr_t next_phys;
	327	uintptr_t pgd_index = pgd_index(va);
	328
	329	if (sz == PGDIR_SIZE) {
	330	if (pgd_val(pgdp[pgd_index]) == 0)
	331	pgdp[pgd_index] = pfn_pgd(PFN_DOWN(pa), prot);
	332	return;
	333	}
	334
	335	if (pgd_val(pgdp[pgd_index]) == 0) {
	336	next_phys = alloc_pgd_next(va);
	337	pgdp[pgd_index] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
	338	nextp = get_pgd_next_virt(next_phys);
	339	memset(nextp, 0, PAGE_SIZE);
	340	} else {
	341	next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_index]));
	342	nextp = get_pgd_next_virt(next_phys);
	343	}
	344
	345	create_pgd_next_mapping(nextp, va, pa, sz, prot);
	346	}
	347
	348	static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
	349	{
0fdc636c ZL	350	/* Upgrade to PMD_SIZE mappings whenever possible */
	351	if ((base & (PMD_SIZE - 1)) \|\| (size & (PMD_SIZE - 1)))
	352	return PAGE_SIZE;
671f9a3e	353
0fdc636c	354	return PMD_SIZE;
671f9a3e AP	355	}
671f9a3e AP	356
387181dc AP	357	/*
	358	* setup_vm() is called from head.S with MMU-off.
	359	*
	360	* Following requirements should be honoured for setup_vm() to work
	361	* correctly:
	362	* 1) It should use PC-relative addressing for accessing kernel symbols.
	363	* To achieve this we always use GCC cmodel=medany.
	364	* 2) The compiler instrumentation for FTRACE will not work for setup_vm()
	365	* so disable compiler instrumentation when FTRACE is enabled.
	366	*
	367	* Currently, the above requirements are honoured by using custom CFLAGS
	368	* for init.o in mm/Makefile.
	369	*/
	370
	371	#ifndef __riscv_cmodel_medany
6a527b67	372	#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
387181dc AP	373	#endif
387181dc AP	374
671f9a3e	375	asmlinkage void __init setup_vm(uintptr_t dtb_pa)
6f1e9e94	376	{
671f9a3e AP	377	uintptr_t va, end_va;
	378	uintptr_t load_pa = (uintptr_t)(&_start);
	379	uintptr_t load_sz = (uintptr_t)(&_end) - load_pa;
	380	uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE);
	381
	382	va_pa_offset = PAGE_OFFSET - load_pa;
	383	pfn_base = PFN_DOWN(load_pa);
6f1e9e94	384
671f9a3e AP	385	/*
	386	* Enforce boot alignment requirements of RV32 and
	387	* RV64 by only allowing PMD or PGD mappings.
	388	*/
	389	BUG_ON(map_size == PAGE_SIZE);
6f1e9e94 AP	390
	391	/* Sanity check alignment and size */
	392	BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
671f9a3e AP	393	BUG_ON((load_pa % map_size) != 0);
	394	BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE);
	395
	396	/* Setup early PGD for fixmap */
	397	create_pgd_mapping(early_pg_dir, FIXADDR_START,
	398	(uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
6f1e9e94 AP	399
6f1e9e94 AP	400	#ifndef __PAGETABLE_PMD_FOLDED
671f9a3e AP	401	/* Setup fixmap PMD */
	402	create_pmd_mapping(fixmap_pmd, FIXADDR_START,
	403	(uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
	404	/* Setup trampoline PGD and PMD */
	405	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
	406	(uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
	407	create_pmd_mapping(trampoline_pmd, PAGE_OFFSET,
	408	load_pa, PMD_SIZE, PAGE_KERNEL_EXEC);
	409	#else
	410	/* Setup trampoline PGD */
	411	create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET,
	412	load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC);
	413	#endif
6f1e9e94	414
671f9a3e AP	415	/*
	416	* Setup early PGD covering entire kernel which will allows
	417	* us to reach paging_init(). We map all memory banks later
	418	* in setup_vm_final() below.
	419	*/
	420	end_va = PAGE_OFFSET + load_sz;
	421	for (va = PAGE_OFFSET; va < end_va; va += map_size)
	422	create_pgd_mapping(early_pg_dir, va,
	423	load_pa + (va - PAGE_OFFSET),
	424	map_size, PAGE_KERNEL_EXEC);
	425
	426	/* Create fixed mapping for early FDT parsing */
	427	end_va = __fix_to_virt(FIX_FDT) + FIX_FDT_SIZE;
	428	for (va = __fix_to_virt(FIX_FDT); va < end_va; va += PAGE_SIZE)
	429	create_pte_mapping(fixmap_pte, va,
	430	dtb_pa + (va - __fix_to_virt(FIX_FDT)),
	431	PAGE_SIZE, PAGE_KERNEL);
	432
	433	/* Save pointer to DTB for early FDT parsing */
	434	dtb_early_va = (void *)fix_to_virt(FIX_FDT) + (dtb_pa & ~PAGE_MASK);
922b0375 AO	435	/* Save physical address for memblock reservation */
922b0375 AO	436	dtb_early_pa = dtb_pa;
671f9a3e	437	}
f2c17aab	438
671f9a3e AP	439	static void __init setup_vm_final(void)
	440	{
	441	uintptr_t va, map_size;
	442	phys_addr_t pa, start, end;
	443	struct memblock_region *reg;
	444
	445	/* Set mmu_enabled flag */
	446	mmu_enabled = true;
6f1e9e94	447
671f9a3e AP	448	/* Setup swapper PGD for fixmap */
671f9a3e AP	449	create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
ac51e005	450	__pa_symbol(fixmap_pgd_next),
671f9a3e	451	PGDIR_SIZE, PAGE_TABLE);
f2c17aab	452
671f9a3e AP	453	/* Map all memory banks */
	454	for_each_memblock(memory, reg) {
	455	start = reg->base;
	456	end = start + reg->size;
	457
	458	if (start >= end)
	459	break;
	460	if (memblock_is_nomap(reg))
	461	continue;
	462	if (start <= __pa(PAGE_OFFSET) &&
	463	__pa(PAGE_OFFSET) < end)
	464	start = __pa(PAGE_OFFSET);
	465
	466	map_size = best_map_size(start, end - start);
	467	for (pa = start; pa < end; pa += map_size) {
	468	va = (uintptr_t)__va(pa);
	469	create_pgd_mapping(swapper_pg_dir, va, pa,
	470	map_size, PAGE_KERNEL_EXEC);
	471	}
6f1e9e94	472	}
f2c17aab	473
671f9a3e AP	474	/* Clear fixmap PTE and PMD mappings */
	475	clear_fixmap(FIX_PTE);
	476	clear_fixmap(FIX_PMD);
	477
	478	/* Move to swapper page table */
ac51e005	479	csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) \| SATP_MODE);
671f9a3e AP	480	local_flush_tlb_all();
671f9a3e AP	481	}
d27c3c90 ZL	482
	483	void free_initmem(void)
	484	{
	485	unsigned long init_begin = (unsigned long)__init_begin;
	486	unsigned long init_end = (unsigned long)__init_end;
	487
	488	/* Make the region as non-execuatble. */
	489	set_memory_nx(init_begin, (init_end - init_begin) >> PAGE_SHIFT);
	490	free_initmem_default(POISON_FREE_INITMEM);
	491	}
	492
6bd33e1e CH	493	#else
	494	asmlinkage void __init setup_vm(uintptr_t dtb_pa)
	495	{
	496	dtb_early_va = (void *)dtb_pa;
	497	}
	498
	499	static inline void setup_vm_final(void)
	500	{
	501	}
	502	#endif /* CONFIG_MMU */
671f9a3e	503
d27c3c90	504	#ifdef CONFIG_STRICT_KERNEL_RWX
d27c3c90 ZL	505	void mark_rodata_ro(void)
	506	{
	507	unsigned long text_start = (unsigned long)_text;
	508	unsigned long text_end = (unsigned long)_etext;
	509	unsigned long rodata_start = (unsigned long)__start_rodata;
	510	unsigned long data_start = (unsigned long)_data;
	511	unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn)));
	512
	513	set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT);
	514	set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
	515	set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT);
	516	set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT);
	517	}
	518	#endif
	519
671f9a3e AP	520	void __init paging_init(void)
	521	{
	522	setup_vm_final();
d95f1a54 LG	523	memblocks_present();
d95f1a54 LG	524	sparse_init();
671f9a3e AP	525	setup_zero_page();
671f9a3e AP	526	zone_sizes_init();
6f1e9e94	527	}
d95f1a54	528
9fe57d8c	529	#ifdef CONFIG_SPARSEMEM_VMEMMAP
d95f1a54 LG	530	int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
	531	struct vmem_altmap *altmap)
	532	{
	533	return vmemmap_populate_basepages(start, end, node);
	534	}
	535	#endif