diff options
Diffstat (limited to 'arch/riscv')
| -rw-r--r-- | arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/asm.h | 1 | ||||
| -rw-r--r-- | arch/riscv/include/asm/bug.h | 16 | ||||
| -rw-r--r-- | arch/riscv/include/asm/pgtable.h | 23 | ||||
| -rw-r--r-- | arch/riscv/include/asm/tlbflush.h | 4 | ||||
| -rw-r--r-- | arch/riscv/kernel/entry.S | 24 | ||||
| -rw-r--r-- | arch/riscv/kernel/traps.c | 26 | ||||
| -rw-r--r-- | arch/riscv/mm/init.c | 14 |
8 files changed, 53 insertions, 56 deletions
diff --git a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts index 104d334511cd..88cfcb96bf23 100644 --- a/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts +++ b/arch/riscv/boot/dts/sifive/hifive-unleashed-a00.dts @@ -13,6 +13,7 @@ compatible = "sifive,hifive-unleashed-a00", "sifive,fu540-c000"; chosen { + stdout-path = "serial0"; }; cpus { diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h index 5a02b7d50940..9c992a88d858 100644 --- a/arch/riscv/include/asm/asm.h +++ b/arch/riscv/include/asm/asm.h @@ -22,6 +22,7 @@ #define REG_L __REG_SEL(ld, lw) #define REG_S __REG_SEL(sd, sw) +#define REG_SC __REG_SEL(sc.d, sc.w) #define SZREG __REG_SEL(8, 4) #define LGREG __REG_SEL(3, 2) diff --git a/arch/riscv/include/asm/bug.h b/arch/riscv/include/asm/bug.h index 07ceee8b1747..75604fec1b1b 100644 --- a/arch/riscv/include/asm/bug.h +++ b/arch/riscv/include/asm/bug.h @@ -12,7 +12,6 @@ #include <asm/asm.h> -#ifdef CONFIG_GENERIC_BUG #define __INSN_LENGTH_MASK _UL(0x3) #define __INSN_LENGTH_32 _UL(0x3) #define __COMPRESSED_INSN_MASK _UL(0xffff) @@ -20,7 +19,6 @@ #define __BUG_INSN_32 _UL(0x00100073) /* ebreak */ #define __BUG_INSN_16 _UL(0x9002) /* c.ebreak */ -#ifndef __ASSEMBLY__ typedef u32 bug_insn_t; #ifdef CONFIG_GENERIC_BUG_RELATIVE_POINTERS @@ -43,6 +41,7 @@ typedef u32 bug_insn_t; RISCV_SHORT " %2" #endif +#ifdef CONFIG_GENERIC_BUG #define __BUG_FLAGS(flags) \ do { \ __asm__ __volatile__ ( \ @@ -58,14 +57,10 @@ do { \ "i" (flags), \ "i" (sizeof(struct bug_entry))); \ } while (0) - -#endif /* !__ASSEMBLY__ */ #else /* CONFIG_GENERIC_BUG */ -#ifndef __ASSEMBLY__ #define __BUG_FLAGS(flags) do { \ __asm__ __volatile__ ("ebreak\n"); \ } while (0) -#endif /* !__ASSEMBLY__ */ #endif /* CONFIG_GENERIC_BUG */ #define BUG() do { \ @@ -79,15 +74,10 @@ do { \ #include <asm-generic/bug.h> -#ifndef __ASSEMBLY__ - struct pt_regs; struct task_struct; -extern void die(struct pt_regs *regs, const char *str); -extern void do_trap(struct pt_regs *regs, int signo, int code, - unsigned long addr); - -#endif /* !__ASSEMBLY__ */ +void die(struct pt_regs *regs, const char *str); +void do_trap(struct pt_regs *regs, int signo, int code, unsigned long addr); #endif /* _ASM_RISCV_BUG_H */ diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 7255f2d8395b..0352f20c29f4 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -87,14 +87,6 @@ extern pgd_t swapper_pg_dir[]; #define VMALLOC_END (PAGE_OFFSET - 1) #define VMALLOC_START (PAGE_OFFSET - VMALLOC_SIZE) -#define FIXADDR_TOP VMALLOC_START -#ifdef CONFIG_64BIT -#define FIXADDR_SIZE PMD_SIZE -#else -#define FIXADDR_SIZE PGDIR_SIZE -#endif -#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) - /* * Roughly size the vmemmap space to be large enough to fit enough * struct pages to map half the virtual address space. Then @@ -108,6 +100,14 @@ extern pgd_t swapper_pg_dir[]; #define vmemmap ((struct page *)VMEMMAP_START) +#define FIXADDR_TOP (VMEMMAP_START) +#ifdef CONFIG_64BIT +#define FIXADDR_SIZE PMD_SIZE +#else +#define FIXADDR_SIZE PGDIR_SIZE +#endif +#define FIXADDR_START (FIXADDR_TOP - FIXADDR_SIZE) + /* * ZERO_PAGE is a global shared page that is always zero, * used for zero-mapped memory areas, etc. @@ -184,10 +184,7 @@ static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot) return __pte((pfn << _PAGE_PFN_SHIFT) | pgprot_val(prot)); } -static inline pte_t mk_pte(struct page *page, pgprot_t prot) -{ - return pfn_pte(page_to_pfn(page), prot); -} +#define mk_pte(page, prot) pfn_pte(page_to_pfn(page), prot) #define pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)) @@ -428,9 +425,7 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#ifdef CONFIG_FLATMEM #define kern_addr_valid(addr) (1) /* FIXME */ -#endif extern void *dtb_early_va; extern void setup_bootmem(void); diff --git a/arch/riscv/include/asm/tlbflush.h b/arch/riscv/include/asm/tlbflush.h index 37ae4e367ad2..f02188a5b0f4 100644 --- a/arch/riscv/include/asm/tlbflush.h +++ b/arch/riscv/include/asm/tlbflush.h @@ -10,10 +10,6 @@ #include <linux/mm_types.h> #include <asm/smp.h> -/* - * Flush entire local TLB. 'sfence.vma' implicitly fences with the instruction - * cache as well, so a 'fence.i' is not necessary. - */ static inline void local_flush_tlb_all(void) { __asm__ __volatile__ ("sfence.vma" : : : "memory"); diff --git a/arch/riscv/kernel/entry.S b/arch/riscv/kernel/entry.S index da7aa88113c2..8ca479831142 100644 --- a/arch/riscv/kernel/entry.S +++ b/arch/riscv/kernel/entry.S @@ -98,7 +98,26 @@ _save_context: */ .macro RESTORE_ALL REG_L a0, PT_SSTATUS(sp) - REG_L a2, PT_SEPC(sp) + /* + * The current load reservation is effectively part of the processor's + * state, in the sense that load reservations cannot be shared between + * different hart contexts. We can't actually save and restore a load + * reservation, so instead here we clear any existing reservation -- + * it's always legal for implementations to clear load reservations at + * any point (as long as the forward progress guarantee is kept, but + * we'll ignore that here). + * + * Dangling load reservations can be the result of taking a trap in the + * middle of an LR/SC sequence, but can also be the result of a taken + * forward branch around an SC -- which is how we implement CAS. As a + * result we need to clear reservations between the last CAS and the + * jump back to the new context. While it is unlikely the store + * completes, implementations are allowed to expand reservations to be + * arbitrarily large. + */ + REG_L a2, PT_SEPC(sp) + REG_SC x0, a2, PT_SEPC(sp) + csrw CSR_SSTATUS, a0 csrw CSR_SEPC, a2 @@ -254,12 +273,11 @@ restore_all: resume_kernel: REG_L s0, TASK_TI_PREEMPT_COUNT(tp) bnez s0, restore_all -need_resched: REG_L s0, TASK_TI_FLAGS(tp) andi s0, s0, _TIF_NEED_RESCHED beqz s0, restore_all call preempt_schedule_irq - j need_resched + j restore_all #endif work_pending: diff --git a/arch/riscv/kernel/traps.c b/arch/riscv/kernel/traps.c index 424eb72d56b1..10a17e545f43 100644 --- a/arch/riscv/kernel/traps.c +++ b/arch/riscv/kernel/traps.c @@ -111,7 +111,6 @@ DO_ERROR_INFO(do_trap_ecall_s, DO_ERROR_INFO(do_trap_ecall_m, SIGILL, ILL_ILLTRP, "environment call from M-mode"); -#ifdef CONFIG_GENERIC_BUG static inline unsigned long get_break_insn_length(unsigned long pc) { bug_insn_t insn; @@ -120,28 +119,15 @@ static inline unsigned long get_break_insn_length(unsigned long pc) return 0; return (((insn & __INSN_LENGTH_MASK) == __INSN_LENGTH_32) ? 4UL : 2UL); } -#endif /* CONFIG_GENERIC_BUG */ asmlinkage void do_trap_break(struct pt_regs *regs) { -#ifdef CONFIG_GENERIC_BUG - if (!user_mode(regs)) { - enum bug_trap_type type; - - type = report_bug(regs->sepc, regs); - switch (type) { - case BUG_TRAP_TYPE_NONE: - break; - case BUG_TRAP_TYPE_WARN: - regs->sepc += get_break_insn_length(regs->sepc); - break; - case BUG_TRAP_TYPE_BUG: - die(regs, "Kernel BUG"); - } - } -#endif /* CONFIG_GENERIC_BUG */ - - force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)(regs->sepc)); + if (user_mode(regs)) + force_sig_fault(SIGTRAP, TRAP_BRKPT, (void __user *)regs->sepc); + else if (report_bug(regs->sepc, regs) == BUG_TRAP_TYPE_WARN) + regs->sepc += get_break_insn_length(regs->sepc); + else + die(regs, "Kernel BUG"); } #ifdef CONFIG_GENERIC_BUG diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index f0ba71304b6e..a1ca6200c31f 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -11,6 +11,7 @@ #include <linux/swap.h> #include <linux/sizes.h> #include <linux/of_fdt.h> +#include <linux/libfdt.h> #include <asm/fixmap.h> #include <asm/tlbflush.h> @@ -82,6 +83,8 @@ disable: } #endif /* CONFIG_BLK_DEV_INITRD */ +static phys_addr_t dtb_early_pa __initdata; + void __init setup_bootmem(void) { struct memblock_region *reg; @@ -117,7 +120,12 @@ void __init setup_bootmem(void) setup_initrd(); #endif /* CONFIG_BLK_DEV_INITRD */ - early_init_fdt_reserve_self(); + /* + * 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(); @@ -393,6 +401,8 @@ asmlinkage void __init setup_vm(uintptr_t dtb_pa) /* 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) @@ -448,7 +458,7 @@ void __init paging_init(void) zone_sizes_init(); } -#ifdef CONFIG_SPARSEMEM +#ifdef CONFIG_SPARSEMEM_VMEMMAP int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, struct vmem_altmap *altmap) { |