diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/riscv/Kconfig | 3 | ||||
| -rw-r--r-- | arch/riscv/include/asm/fixmap.h | 44 | ||||
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 1 | ||||
| -rw-r--r-- | arch/riscv/kernel/setup.c | 130 | ||||
| -rw-r--r-- | arch/riscv/kernel/smp.c | 2 | ||||
| -rw-r--r-- | arch/riscv/mm/init.c | 156 |
6 files changed, 208 insertions, 128 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index b60f4e3e36f4..ceed055179c8 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -89,6 +89,9 @@ config GENERIC_CSUM config GENERIC_HWEIGHT def_bool y +config FIX_EARLYCON_MEM + def_bool y + config PGTABLE_LEVELS int default 3 if 64BIT diff --git a/arch/riscv/include/asm/fixmap.h b/arch/riscv/include/asm/fixmap.h new file mode 100644 index 000000000000..57afe604b495 --- /dev/null +++ b/arch/riscv/include/asm/fixmap.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2019 Western Digital Corporation or its affiliates. + */ + +#ifndef _ASM_RISCV_FIXMAP_H +#define _ASM_RISCV_FIXMAP_H + +#include <linux/kernel.h> +#include <linux/sizes.h> +#include <asm/page.h> +#include <asm/pgtable.h> + +/* + * Here we define all the compile-time 'special' virtual addresses. + * The point is to have a constant address at compile time, but to + * set the physical address only in the boot process. + * + * These 'compile-time allocated' memory buffers are page-sized. Use + * set_fixmap(idx,phys) to associate physical memory with fixmap indices. + */ +enum fixed_addresses { + FIX_HOLE, + FIX_EARLYCON_MEM_BASE, + __end_of_fixed_addresses +}; + +#define FIXADDR_SIZE (__end_of_fixed_addresses * PAGE_SIZE) +#define FIXADDR_TOP (PAGE_OFFSET) +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) + +#define FIXMAP_PAGE_IO PAGE_KERNEL + +#define __early_set_fixmap __set_fixmap + +#define __late_set_fixmap __set_fixmap +#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR) + +extern void __set_fixmap(enum fixed_addresses idx, + phys_addr_t phys, pgprot_t prot); + +#include <asm-generic/fixmap.h> + +#endif /* _ASM_RISCV_FIXMAP_H */ diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index a8179a8c1491..1141364d990e 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -404,6 +404,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, #define kern_addr_valid(addr) (1) /* FIXME */ #endif +extern void setup_bootmem(void); extern void paging_init(void); static inline void pgtable_cache_init(void) diff --git a/arch/riscv/kernel/setup.c b/arch/riscv/kernel/setup.c index 12a16df4d422..ecb654f6a79e 100644 --- a/arch/riscv/kernel/setup.c +++ b/arch/riscv/kernel/setup.c @@ -23,7 +23,6 @@ #include <linux/mm.h> #include <linux/memblock.h> #include <linux/sched.h> -#include <linux/initrd.h> #include <linux/console.h> #include <linux/screen_info.h> #include <linux/of_fdt.h> @@ -61,83 +60,6 @@ EXPORT_SYMBOL(empty_zero_page); atomic_t hart_lottery; unsigned long boot_cpu_hartid; -#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(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(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 */ - -pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; -pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); - -#ifndef __PAGETABLE_PMD_FOLDED -#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT) -pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss; -pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); -#endif - -asmlinkage void __init setup_vm(void) -{ - extern char _start; - uintptr_t i; - uintptr_t pa = (uintptr_t) &_start; - pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC); - - va_pa_offset = PAGE_OFFSET - pa; - pfn_base = PFN_DOWN(pa); - - /* Sanity check alignment and size */ - BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); - BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0); - -#ifndef __PAGETABLE_PMD_FOLDED - trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = - pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd), - __pgprot(_PAGE_TABLE)); - trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot); - - for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { - size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; - swapper_pg_dir[o] = - pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i, - __pgprot(_PAGE_TABLE)); - } - for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++) - swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot); -#else - trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = - pfn_pgd(PFN_DOWN(pa), prot); - - for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { - size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; - swapper_pg_dir[o] = - pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot); - } -#endif -} - void __init parse_dtb(unsigned int hartid, void *dtb) { if (early_init_dt_scan(__va(dtb))) @@ -150,60 +72,17 @@ void __init parse_dtb(unsigned int hartid, void *dtb) #endif } -static void __init setup_bootmem(void) -{ - struct memblock_region *reg; - phys_addr_t mem_size = 0; - - /* Find the memory region containing the kernel */ - for_each_memblock(memory, reg) { - phys_addr_t vmlinux_end = __pa(_end); - phys_addr_t end = reg->base + reg->size; - - if (reg->base <= vmlinux_end && vmlinux_end <= end) { - /* - * Reserve from the start of the region to the end of - * the kernel - */ - memblock_reserve(reg->base, vmlinux_end - reg->base); - mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); - } - } - BUG_ON(mem_size == 0); - - set_max_mapnr(PFN_DOWN(mem_size)); - max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); - -#ifdef CONFIG_BLK_DEV_INITRD - setup_initrd(); -#endif /* CONFIG_BLK_DEV_INITRD */ - - early_init_fdt_reserve_self(); - 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); - } -} - void __init setup_arch(char **cmdline_p) { - *cmdline_p = boot_command_line; - - parse_early_param(); - init_mm.start_code = (unsigned long) _stext; init_mm.end_code = (unsigned long) _etext; init_mm.end_data = (unsigned long) _edata; init_mm.brk = (unsigned long) _end; + *cmdline_p = boot_command_line; + + parse_early_param(); + setup_bootmem(); paging_init(); unflatten_device_tree(); @@ -222,4 +101,3 @@ void __init setup_arch(char **cmdline_p) riscv_fill_hwcap(); } - diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c index ca99f0fb49b1..0c41d07ec281 100644 --- a/arch/riscv/kernel/smp.c +++ b/arch/riscv/kernel/smp.c @@ -42,7 +42,7 @@ unsigned long __cpuid_to_hartid_map[NR_CPUS] = { void __init smp_setup_processor_id(void) { - cpuid_to_hartid_map(0) = boot_cpu_hartid; + cpuid_to_hartid_map(0) = boot_cpu_hartid; } /* A collection of single bit ipi messages. */ diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 658ebf645f42..b379a75ac6a6 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -17,7 +17,9 @@ #include <linux/initrd.h> #include <linux/swap.h> #include <linux/sizes.h> +#include <linux/of_fdt.h> +#include <asm/fixmap.h> #include <asm/tlbflush.h> #include <asm/sections.h> #include <asm/pgtable.h> @@ -66,7 +68,159 @@ void free_initmem(void) } #ifdef CONFIG_BLK_DEV_INITRD -void free_initrd_mem(unsigned long start, unsigned long end) +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(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(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; +} + +void __init free_initrd_mem(unsigned long start, unsigned long end) +{ + free_reserved_area((void *)start, (void *)end, -1, "initrd"); } #endif /* CONFIG_BLK_DEV_INITRD */ + +void __init setup_bootmem(void) +{ + struct memblock_region *reg; + phys_addr_t mem_size = 0; + + /* Find the memory region containing the kernel */ + for_each_memblock(memory, reg) { + phys_addr_t vmlinux_end = __pa(_end); + phys_addr_t end = reg->base + reg->size; + + if (reg->base <= vmlinux_end && vmlinux_end <= end) { + /* + * Reserve from the start of the region to the end of + * the kernel + */ + memblock_reserve(reg->base, vmlinux_end - reg->base); + mem_size = min(reg->size, (phys_addr_t)-PAGE_OFFSET); + } + } + BUG_ON(mem_size == 0); + + set_max_mapnr(PFN_DOWN(mem_size)); + max_low_pfn = PFN_DOWN(memblock_end_of_DRAM()); + +#ifdef CONFIG_BLK_DEV_INITRD + setup_initrd(); +#endif /* CONFIG_BLK_DEV_INITRD */ + + early_init_fdt_reserve_self(); + 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); + } +} + +pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; +pgd_t trampoline_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); + +#ifndef __PAGETABLE_PMD_FOLDED +#define NUM_SWAPPER_PMDS ((uintptr_t)-PAGE_OFFSET >> PGDIR_SHIFT) +pmd_t swapper_pmd[PTRS_PER_PMD*((-PAGE_OFFSET)/PGDIR_SIZE)] __page_aligned_bss; +pmd_t trampoline_pmd[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); +pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; +#endif + +pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; + +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); + } +} + +asmlinkage void __init setup_vm(void) +{ + extern char _start; + uintptr_t i; + uintptr_t pa = (uintptr_t) &_start; + pgprot_t prot = __pgprot(pgprot_val(PAGE_KERNEL) | _PAGE_EXEC); + + va_pa_offset = PAGE_OFFSET - pa; + pfn_base = PFN_DOWN(pa); + + /* Sanity check alignment and size */ + BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); + BUG_ON((pa % (PAGE_SIZE * PTRS_PER_PTE)) != 0); + +#ifndef __PAGETABLE_PMD_FOLDED + trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = + pfn_pgd(PFN_DOWN((uintptr_t)trampoline_pmd), + __pgprot(_PAGE_TABLE)); + trampoline_pmd[0] = pfn_pmd(PFN_DOWN(pa), prot); + + for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { + size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; + + swapper_pg_dir[o] = + pfn_pgd(PFN_DOWN((uintptr_t)swapper_pmd) + i, + __pgprot(_PAGE_TABLE)); + } + for (i = 0; i < ARRAY_SIZE(swapper_pmd); i++) + swapper_pmd[i] = pfn_pmd(PFN_DOWN(pa + i * PMD_SIZE), prot); + + swapper_pg_dir[(FIXADDR_START >> PGDIR_SHIFT) % PTRS_PER_PGD] = + pfn_pgd(PFN_DOWN((uintptr_t)fixmap_pmd), + __pgprot(_PAGE_TABLE)); + fixmap_pmd[(FIXADDR_START >> PMD_SHIFT) % PTRS_PER_PMD] = + pfn_pmd(PFN_DOWN((uintptr_t)fixmap_pte), + __pgprot(_PAGE_TABLE)); +#else + trampoline_pg_dir[(PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD] = + pfn_pgd(PFN_DOWN(pa), prot); + + for (i = 0; i < (-PAGE_OFFSET)/PGDIR_SIZE; ++i) { + size_t o = (PAGE_OFFSET >> PGDIR_SHIFT) % PTRS_PER_PGD + i; + + swapper_pg_dir[o] = + pfn_pgd(PFN_DOWN(pa + i * PGDIR_SIZE), prot); + } + + swapper_pg_dir[(FIXADDR_START >> PGDIR_SHIFT) % PTRS_PER_PGD] = + pfn_pgd(PFN_DOWN((uintptr_t)fixmap_pte), + __pgprot(_PAGE_TABLE)); +#endif +} |