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August 2019

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Re: [U-Boot] [PATCH 2/2] riscv: Access CSRs using CSR numbers
by Rick Chen 01 Aug '19

01 Aug '19

> > From: Bin Meng [mailto:bmeng.cn@gmail.com] > > Sent: Thursday, July 11, 2019 2:43 PM > > To: Rick Jian-Zhi Chen(陳建志); Anup Patel; Lukas Auer; U-Boot Mailing List > > Subject: [PATCH 2/2] riscv: Access CSRs using CSR numbers > > > > We should prefer accessing CSRs using their CSR numbers > > because: > > 1. It compiles fine with older toolchains. > > 2. We can use latest CSR names in #define macro names of CSR > > numbers as-per RISC-V spec. > > 3. We can access newly added CSRs even if toolchain does not > > recognize newly added CSRs by name. > > > > This commit is inspired from Linux kernel commit a3182c91ef4e > > ("RISC-V: Access CSRs using CSR numbers"). > > > > Signed-off-by: Bin Meng <bmeng.cn(a)gmail.com> > > --- > > > > arch/riscv/cpu/cpu.c | 9 +- > > arch/riscv/cpu/start.S | 3 +- > > arch/riscv/include/asm/csr.h | 12 ++ > > arch/riscv/include/asm/encoding.h | 238 +------------------------------------- > > 4 files changed, 19 insertions(+), 243 deletions(-) > > > > diff --git a/arch/riscv/cpu/cpu.c b/arch/riscv/cpu/cpu.c index e9a8b43..5ca1857 > > 100644 > > --- a/arch/riscv/cpu/cpu.c > > +++ b/arch/riscv/cpu/cpu.c > > @@ -7,7 +7,6 @@ > > #include <cpu.h> > > #include <dm.h> > > #include <log.h> > > -#include <asm/csr.h> > > #include <asm/encoding.h> > > #include <dm/uclass-internal.h> > > > > @@ -48,7 +47,7 @@ static inline bool supports_extension(char ext) > > return false; > > #else /* !CONFIG_CPU */ > > #ifdef CONFIG_RISCV_MMODE > > - return csr_read(misa) & (1 << (ext - 'a')); > > + return csr_read(CSR_MISA) & (1 << (ext - 'a')); > > #else /* !CONFIG_RISCV_MMODE */ > > #warning "There is no way to determine the available extensions in S-mode." > > #warning "Please convert your board to use the RISC-V CPU driver." > > @@ -82,7 +81,7 @@ int arch_cpu_init_dm(void) > > /* Enable FPU */ > > if (supports_extension('d') || supports_extension('f')) { > > csr_set(MODE_PREFIX(status), MSTATUS_FS); > > - csr_write(fcsr, 0); > > + csr_write(CSR_FCSR, 0); > > } > > > > if (CONFIG_IS_ENABLED(RISCV_MMODE)) { > > @@ -90,11 +89,11 @@ int arch_cpu_init_dm(void) > > * Enable perf counters for cycle, time, > > * and instret counters only > > */ > > - csr_write(mcounteren, GENMASK(2, 0)); > > + csr_write(CSR_MCOUNTEREN, GENMASK(2, 0)); > > > > /* Disable paging */ > > if (supports_extension('s')) > > - csr_write(satp, 0); > > + csr_write(CSR_SATP, 0); > > } > > > > return 0; > > diff --git a/arch/riscv/cpu/start.S b/arch/riscv/cpu/start.S index > > 60ac8c6..e06db40 100644 > > --- a/arch/riscv/cpu/start.S > > +++ b/arch/riscv/cpu/start.S > > @@ -13,7 +13,6 @@ > > #include <config.h> > > #include <common.h> > > #include <elf.h> > > -#include <asm/csr.h> > > #include <asm/encoding.h> > > #include <generated/asm-offsets.h> > > > > @@ -41,7 +40,7 @@ secondary_harts_relocation_error: > > .globl _start > > _start: > > #ifdef CONFIG_RISCV_MMODE > > - csrr a0, mhartid > > + csrr a0, CSR_MHARTID > > #endif > > > > /* save hart id and dtb pointer */ > > diff --git a/arch/riscv/include/asm/csr.h b/arch/riscv/include/asm/csr.h index > > 1a6bcfc..d152074 100644 > > --- a/arch/riscv/include/asm/csr.h > > +++ b/arch/riscv/include/asm/csr.h > > @@ -75,6 +75,7 @@ > > #define SIE_STIE (_AC(0x1, UL) << IRQ_S_TIMER) > > #define SIE_SEIE (_AC(0x1, UL) << IRQ_S_EXT) > > > > +#define CSR_FCSR 0x003 > > #define CSR_CYCLE 0xc00 > > #define CSR_TIME 0xc01 > > #define CSR_INSTRET 0xc02 > > @@ -88,9 +89,20 @@ > > #define CSR_STVAL 0x143 > > #define CSR_SIP 0x144 > > #define CSR_SATP 0x180 > > +#define CSR_MSTATUS 0x300 > > +#define CSR_MISA 0x301 > > +#define CSR_MIE 0x304 > > +#define CSR_MTVEC 0x305 > > +#define CSR_MCOUNTEREN 0x306 > > +#define CSR_MSCRATCH 0x340 > > +#define CSR_MEPC 0x341 > > +#define CSR_MCAUSE 0x342 > > +#define CSR_MTVAL 0x343 > > +#define CSR_MIP 0x344 > > #define CSR_CYCLEH 0xc80 > > #define CSR_TIMEH 0xc81 > > #define CSR_INSTRETH 0xc82 > > +#define CSR_MHARTID 0xf14 > > > > #ifndef __ASSEMBLY__ > > > > diff --git a/arch/riscv/include/asm/encoding.h > > b/arch/riscv/include/asm/encoding.h > > index 772668c..c450eb9 100644 > > --- a/arch/riscv/include/asm/encoding.h > > +++ b/arch/riscv/include/asm/encoding.h > > @@ -7,6 +7,8 @@ > > #ifndef RISCV_CSR_ENCODING_H > > #define RISCV_CSR_ENCODING_H > > > > +#include <asm/csr.h> > > + > > #ifdef CONFIG_RISCV_SMODE > > #define MODE_PREFIX(__suffix) s##__suffix > > #else > > @@ -49,13 +51,10 @@ > > #define SSTATUS64_SD 0x8000000000000000 > > > > #define MIP_SSIP BIT(IRQ_S_SOFT) > > -#define MIP_HSIP BIT(IRQ_H_SOFT) > > #define MIP_MSIP BIT(IRQ_M_SOFT) > > #define MIP_STIP BIT(IRQ_S_TIMER) > > -#define MIP_HTIP BIT(IRQ_H_TIMER) > > #define MIP_MTIP BIT(IRQ_M_TIMER) > > #define MIP_SEIP BIT(IRQ_S_EXT) > > -#define MIP_HEIP BIT(IRQ_H_EXT) > > #define MIP_MEIP BIT(IRQ_M_EXT) > > > > #define SIP_SSIP MIP_SSIP > > @@ -73,18 +72,6 @@ > > #define VM_SV39 9 > > #define VM_SV48 10 > > > > -#define IRQ_S_SOFT 1 > > -#define IRQ_H_SOFT 2 > > -#define IRQ_M_SOFT 3 > > -#define IRQ_S_TIMER 5 > > -#define IRQ_H_TIMER 6 > > -#define IRQ_M_TIMER 7 > > -#define IRQ_S_EXT 9 > > -#define IRQ_H_EXT 10 > > -#define IRQ_M_EXT 11 > > -#define IRQ_COP 12 > > -#define IRQ_HOST 13 > > - > > #define CAUSE_MISALIGNED_FETCH 0 > > #define CAUSE_FETCH_ACCESS 1 > > #define CAUSE_ILLEGAL_INSTRUCTION 2 > > @@ -167,227 +154,6 @@ > > #define RISCV_PGSHIFT 12 > > #define RISCV_PGSIZE BIT(RISCV_PGSHIFT) > > > > -/* CSR numbers */ > > -#define CSR_FFLAGS 0x1 > > -#define CSR_FRM 0x2 > > -#define CSR_FCSR 0x3 > > - > > -#define CSR_SSTATUS 0x100 > > -#define CSR_SEDELEG 0x102 > > -#define CSR_SIDELEG 0x103 > > -#define CSR_SIE 0x104 > > -#define CSR_STVEC 0x105 > > -#define CSR_SCOUNTEREN 0x106 > > -#define CSR_SSCRATCH 0x140 > > -#define CSR_SEPC 0x141 > > -#define CSR_SCAUSE 0x142 > > -#define CSR_STVAL 0x143 > > -#define CSR_SIP 0x144 > > -#define CSR_SATP 0x180 > > - > > -#define CSR_MSTATUS 0x300 > > -#define CSR_MISA 0x301 > > -#define CSR_MEDELEG 0x302 > > -#define CSR_MIDELEG 0x303 > > -#define CSR_MIE 0x304 > > -#define CSR_MTVEC 0x305 > > -#define CSR_MCOUNTEREN 0x306 > > -#define CSR_MHPMEVENT3 0x323 > > -#define CSR_MHPMEVENT4 0x324 > > -#define CSR_MHPMEVENT5 0x325 > > -#define CSR_MHPMEVENT6 0x326 > > -#define CSR_MHPMEVENT7 0x327 > > -#define CSR_MHPMEVENT8 0x328 > > -#define CSR_MHPMEVENT9 0x329 > > -#define CSR_MHPMEVENT10 0x32a > > -#define CSR_MHPMEVENT11 0x32b > > -#define CSR_MHPMEVENT12 0x32c > > -#define CSR_MHPMEVENT13 0x32d > > -#define CSR_MHPMEVENT14 0x32e > > -#define CSR_MHPMEVENT15 0x32f > > -#define CSR_MHPMEVENT16 0x330 > > -#define CSR_MHPMEVENT17 0x331 > > -#define CSR_MHPMEVENT18 0x332 > > -#define CSR_MHPMEVENT19 0x333 > > -#define CSR_MHPMEVENT20 0x334 > > -#define CSR_MHPMEVENT21 0x335 > > -#define CSR_MHPMEVENT22 0x336 > > -#define CSR_MHPMEVENT23 0x337 > > -#define CSR_MHPMEVENT24 0x338 > > -#define CSR_MHPMEVENT25 0x339 > > -#define CSR_MHPMEVENT26 0x33a > > -#define CSR_MHPMEVENT27 0x33b > > -#define CSR_MHPMEVENT28 0x33c > > -#define CSR_MHPMEVENT29 0x33d > > -#define CSR_MHPMEVENT30 0x33e > > -#define CSR_MHPMEVENT31 0x33f > > -#define CSR_MSCRATCH 0x340 > > -#define CSR_MEPC 0x341 > > -#define CSR_MCAUSE 0x342 > > -#define CSR_MTVAL 0x343 > > -#define CSR_MIP 0x344 > > -#define CSR_PMPCFG0 0x3a0 > > -#define CSR_PMPCFG1 0x3a1 > > -#define CSR_PMPCFG2 0x3a2 > > -#define CSR_PMPCFG3 0x3a3 > > -#define CSR_PMPADDR0 0x3b0 > > -#define CSR_PMPADDR1 0x3b1 > > -#define CSR_PMPADDR2 0x3b2 > > -#define CSR_PMPADDR3 0x3b3 > > -#define CSR_PMPADDR4 0x3b4 > > -#define CSR_PMPADDR5 0x3b5 > > -#define CSR_PMPADDR6 0x3b6 > > -#define CSR_PMPADDR7 0x3b7 > > -#define CSR_PMPADDR8 0x3b8 > > -#define CSR_PMPADDR9 0x3b9 > > -#define CSR_PMPADDR10 0x3ba > > -#define CSR_PMPADDR11 0x3bb > > -#define CSR_PMPADDR12 0x3bc > > -#define CSR_PMPADDR13 0x3bd > > -#define CSR_PMPADDR14 0x3be > > -#define CSR_PMPADDR15 0x3bf > > - > > -#define CSR_TSELECT 0x7a0 > > -#define CSR_TDATA1 0x7a1 > > -#define CSR_TDATA2 0x7a2 > > -#define CSR_TDATA3 0x7a3 > > -#define CSR_DCSR 0x7b0 > > -#define CSR_DPC 0x7b1 > > -#define CSR_DSCRATCH 0x7b2 > > - > > -#define CSR_MCYCLE 0xb00 > > -#define CSR_MINSTRET 0xb02 > > -#define CSR_MHPMCOUNTER3 0xb03 > > -#define CSR_MHPMCOUNTER4 0xb04 > > -#define CSR_MHPMCOUNTER5 0xb05 > > -#define CSR_MHPMCOUNTER6 0xb06 > > -#define CSR_MHPMCOUNTER7 0xb07 > > -#define CSR_MHPMCOUNTER8 0xb08 > > -#define CSR_MHPMCOUNTER9 0xb09 > > -#define CSR_MHPMCOUNTER10 0xb0a > > -#define CSR_MHPMCOUNTER11 0xb0b > > -#define CSR_MHPMCOUNTER12 0xb0c > > -#define CSR_MHPMCOUNTER13 0xb0d > > -#define CSR_MHPMCOUNTER14 0xb0e > > -#define CSR_MHPMCOUNTER15 0xb0f > > -#define CSR_MHPMCOUNTER16 0xb10 > > -#define CSR_MHPMCOUNTER17 0xb11 > > -#define CSR_MHPMCOUNTER18 0xb12 > > -#define CSR_MHPMCOUNTER19 0xb13 > > -#define CSR_MHPMCOUNTER20 0xb14 > > -#define CSR_MHPMCOUNTER21 0xb15 > > -#define CSR_MHPMCOUNTER22 0xb16 > > -#define CSR_MHPMCOUNTER23 0xb17 > > -#define CSR_MHPMCOUNTER24 0xb18 > > -#define CSR_MHPMCOUNTER25 0xb19 > > -#define CSR_MHPMCOUNTER26 0xb1a > > -#define CSR_MHPMCOUNTER27 0xb1b > > -#define CSR_MHPMCOUNTER28 0xb1c > > -#define CSR_MHPMCOUNTER29 0xb1d > > -#define CSR_MHPMCOUNTER30 0xb1e > > -#define CSR_MHPMCOUNTER31 0xb1f > > -#define CSR_MCYCLEH 0xb80 > > -#define CSR_MINSTRETH 0xb82 > > -#define CSR_MHPMCOUNTER3H 0xb83 > > -#define CSR_MHPMCOUNTER4H 0xb84 > > -#define CSR_MHPMCOUNTER5H 0xb85 > > -#define CSR_MHPMCOUNTER6H 0xb86 > > -#define CSR_MHPMCOUNTER7H 0xb87 > > -#define CSR_MHPMCOUNTER8H 0xb88 > > -#define CSR_MHPMCOUNTER9H 0xb89 > > -#define CSR_MHPMCOUNTER10H 0xb8a > > -#define CSR_MHPMCOUNTER11H 0xb8b > > -#define CSR_MHPMCOUNTER12H 0xb8c > > -#define CSR_MHPMCOUNTER13H 0xb8d > > -#define CSR_MHPMCOUNTER14H 0xb8e > > -#define CSR_MHPMCOUNTER15H 0xb8f > > -#define CSR_MHPMCOUNTER16H 0xb90 > > -#define CSR_MHPMCOUNTER17H 0xb91 > > -#define CSR_MHPMCOUNTER18H 0xb92 > > -#define CSR_MHPMCOUNTER19H 0xb93 > > -#define CSR_MHPMCOUNTER20H 0xb94 > > -#define CSR_MHPMCOUNTER21H 0xb95 > > -#define CSR_MHPMCOUNTER22H 0xb96 > > -#define CSR_MHPMCOUNTER23H 0xb97 > > -#define CSR_MHPMCOUNTER24H 0xb98 > > -#define CSR_MHPMCOUNTER25H 0xb99 > > -#define CSR_MHPMCOUNTER26H 0xb9a > > -#define CSR_MHPMCOUNTER27H 0xb9b > > -#define CSR_MHPMCOUNTER28H 0xb9c > > -#define CSR_MHPMCOUNTER29H 0xb9d > > -#define CSR_MHPMCOUNTER30H 0xb9e > > -#define CSR_MHPMCOUNTER31H 0xb9f > > - > > -#define CSR_CYCLE 0xc00 > > -#define CSR_TIME 0xc01 > > -#define CSR_INSTRET 0xc02 > > -#define CSR_HPMCOUNTER3 0xc03 > > -#define CSR_HPMCOUNTER4 0xc04 > > -#define CSR_HPMCOUNTER5 0xc05 > > -#define CSR_HPMCOUNTER6 0xc06 > > -#define CSR_HPMCOUNTER7 0xc07 > > -#define CSR_HPMCOUNTER8 0xc08 > > -#define CSR_HPMCOUNTER9 0xc09 > > -#define CSR_HPMCOUNTER10 0xc0a > > -#define CSR_HPMCOUNTER11 0xc0b > > -#define CSR_HPMCOUNTER12 0xc0c > > -#define CSR_HPMCOUNTER13 0xc0d > > -#define CSR_HPMCOUNTER14 0xc0e > > -#define CSR_HPMCOUNTER15 0xc0f > > -#define CSR_HPMCOUNTER16 0xc10 > > -#define CSR_HPMCOUNTER17 0xc11 > > -#define CSR_HPMCOUNTER18 0xc12 > > -#define CSR_HPMCOUNTER19 0xc13 > > -#define CSR_HPMCOUNTER20 0xc14 > > -#define CSR_HPMCOUNTER21 0xc15 > > -#define CSR_HPMCOUNTER22 0xc16 > > -#define CSR_HPMCOUNTER23 0xc17 > > -#define CSR_HPMCOUNTER24 0xc18 > > -#define CSR_HPMCOUNTER25 0xc19 > > -#define CSR_HPMCOUNTER26 0xc1a > > -#define CSR_HPMCOUNTER27 0xc1b > > -#define CSR_HPMCOUNTER28 0xc1c > > -#define CSR_HPMCOUNTER29 0xc1d > > -#define CSR_HPMCOUNTER30 0xc1e > > -#define CSR_HPMCOUNTER31 0xc1f > > -#define CSR_CYCLEH 0xc80 > > -#define CSR_TIMEH 0xc81 > > -#define CSR_INSTRETH 0xc82 > > -#define CSR_HPMCOUNTER3H 0xc83 > > -#define CSR_HPMCOUNTER4H 0xc84 > > -#define CSR_HPMCOUNTER5H 0xc85 > > -#define CSR_HPMCOUNTER6H 0xc86 > > -#define CSR_HPMCOUNTER7H 0xc87 > > -#define CSR_HPMCOUNTER8H 0xc88 > > -#define CSR_HPMCOUNTER9H 0xc89 > > -#define CSR_HPMCOUNTER10H 0xc8a > > -#define CSR_HPMCOUNTER11H 0xc8b > > -#define CSR_HPMCOUNTER12H 0xc8c > > -#define CSR_HPMCOUNTER13H 0xc8d > > -#define CSR_HPMCOUNTER14H 0xc8e > > -#define CSR_HPMCOUNTER15H 0xc8f > > -#define CSR_HPMCOUNTER16H 0xc90 > > -#define CSR_HPMCOUNTER17H 0xc91 > > -#define CSR_HPMCOUNTER18H 0xc92 > > -#define CSR_HPMCOUNTER19H 0xc93 > > -#define CSR_HPMCOUNTER20H 0xc94 > > -#define CSR_HPMCOUNTER21H 0xc95 > > -#define CSR_HPMCOUNTER22H 0xc96 > > -#define CSR_HPMCOUNTER23H 0xc97 > > -#define CSR_HPMCOUNTER24H 0xc98 > > -#define CSR_HPMCOUNTER25H 0xc99 > > -#define CSR_HPMCOUNTER26H 0xc9a > > -#define CSR_HPMCOUNTER27H 0xc9b > > -#define CSR_HPMCOUNTER28H 0xc9c > > -#define CSR_HPMCOUNTER29H 0xc9d > > -#define CSR_HPMCOUNTER30H 0xc9e > > -#define CSR_HPMCOUNTER31H 0xc9f > > - > > -#define CSR_MVENDORID 0xf11 > > -#define CSR_MARCHID 0xf12 > > -#define CSR_MIMPID 0xf13 > > -#define CSR_MHARTID 0xf14 > > - > > #endif /* __riscv */ > > > > #endif /* RISCV_CSR_ENCODING_H */ Reviewed-by: Rick Chen <rick(a)andestech.com> > > -- > > 2.7.4 >

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