csr.h

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/*
 * Copyright (c) 2020 Michael Schaffner
 * Copyright (c) 2020 BayLibre, SAS
 *
 * SPDX-License-Identifier: SHL-0.51
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef CSR_H_
#define CSR_H_
 
#define MSTATUS_UIE     0x00000001
#define MSTATUS_SIE     0x00000002
#define MSTATUS_HIE     0x00000004
#define MSTATUS_MIE     0x00000008
#define MSTATUS_UPIE    0x00000010
#define MSTATUS_SPIE    0x00000020
#define MSTATUS_HPIE    0x00000040
#define MSTATUS_MPIE    0x00000080
#define MSTATUS_SPP     0x00000100
#define MSTATUS_HPP     0x00000600
#define MSTATUS_MPP     0x00001800
#define MSTATUS_FS      0x00006000
#define MSTATUS_XS      0x00018000
#define MSTATUS_MPRV    0x00020000
#define MSTATUS_SUM     0x00040000
#define MSTATUS_MXR     0x00080000
#define MSTATUS_TVM     0x00100000
#define MSTATUS_TW      0x00200000
#define MSTATUS_TSR     0x00400000
#define MSTATUS32_SD    0x80000000
#define MSTATUS_UXL     0x0000000300000000
#define MSTATUS_SXL     0x0000000C00000000
#define MSTATUS64_SD    0x8000000000000000
 
#define SSTATUS_UIE     0x00000001
#define SSTATUS_SIE     0x00000002
#define SSTATUS_UPIE    0x00000010
#define SSTATUS_SPIE    0x00000020
#define SSTATUS_SPP     0x00000100
#define SSTATUS_FS      0x00006000
#define SSTATUS_XS      0x00018000
#define SSTATUS_SUM     0x00040000
#define SSTATUS_MXR     0x00080000
#define SSTATUS32_SD    0x80000000
#define SSTATUS_UXL     0x0000000300000000
#define SSTATUS64_SD    0x8000000000000000
 
#define DCSR_XDEBUGVER  (3U<<30)
#define DCSR_NDRESET    (1<<29)
#define DCSR_FULLRESET  (1<<28)
#define DCSR_EBREAKM    (1<<15)
#define DCSR_EBREAKH    (1<<14)
#define DCSR_EBREAKS    (1<<13)
#define DCSR_EBREAKU    (1<<12)
#define DCSR_STOPCYCLE  (1<<10)
#define DCSR_STOPTIME   (1<<9)
#define DCSR_CAUSE      (7<<6)
#define DCSR_DEBUGINT   (1<<5)
#define DCSR_HALT       (1<<3)
#define DCSR_STEP       (1<<2)
#define DCSR_PRV        (3<<0)
 
#define DCSR_CAUSE_NONE         0
#define DCSR_CAUSE_SWBP         1
#define DCSR_CAUSE_HWBP         2
#define DCSR_CAUSE_DEBUGINT     3
#define DCSR_CAUSE_STEP         4
#define DCSR_CAUSE_HALT         5
 
#define MCONTROL_TYPE(xlen)     (0xfULL<<((xlen)-4))
#define MCONTROL_DMODE(xlen)    (1ULL<<((xlen)-5))
#define MCONTROL_MASKMAX(xlen)  (0x3fULL<<((xlen)-11))
 
#define MCONTROL_SELECT         (1<<19)
#define MCONTROL_TIMING         (1<<18)
#define MCONTROL_ACTION         (0x3f<<12)
#define MCONTROL_CHAIN          (1<<11)
#define MCONTROL_MATCH          (0xf<<7)
#define MCONTROL_M              (1<<6)
#define MCONTROL_H              (1<<5)
#define MCONTROL_S              (1<<4)
#define MCONTROL_U              (1<<3)
#define MCONTROL_EXECUTE        (1<<2)
#define MCONTROL_STORE          (1<<1)
#define MCONTROL_LOAD           (1<<0)
 
#define MCONTROL_TYPE_NONE      0
#define MCONTROL_TYPE_MATCH     2
 
#define MCONTROL_ACTION_DEBUG_EXCEPTION 0
#define MCONTROL_ACTION_DEBUG_MODE      1
#define MCONTROL_ACTION_TRACE_START     2
#define MCONTROL_ACTION_TRACE_STOP      3
#define MCONTROL_ACTION_TRACE_EMIT      4
 
#define MCONTROL_MATCH_EQUAL            0
#define MCONTROL_MATCH_NAPOT            1
#define MCONTROL_MATCH_GE               2
#define MCONTROL_MATCH_LT               3
#define MCONTROL_MATCH_MASK_LOW         4
#define MCONTROL_MATCH_MASK_HIGH        5
 
#define MIP_SSIP        (1 << IRQ_S_SOFT)
#define MIP_HSIP        (1 << IRQ_H_SOFT)
#define MIP_MSIP        (1 << IRQ_M_SOFT)
#define MIP_STIP        (1 << IRQ_S_TIMER)
#define MIP_HTIP        (1 << IRQ_H_TIMER)
#define MIP_MTIP        (1 << IRQ_M_TIMER)
#define MIP_SEIP        (1 << IRQ_S_EXT)
#define MIP_HEIP        (1 << IRQ_H_EXT)
#define MIP_MEIP        (1 << IRQ_M_EXT)
 
#define SIP_SSIP        MIP_SSIP
#define SIP_STIP        MIP_STIP
 
#define PRV_U   0
#define PRV_S   1
#define PRV_H   2
#define PRV_M   3
 
#define SATP32_MODE     0x80000000
#define SATP32_ASID     0x7FC00000
#define SATP32_PPN      0x003FFFFF
#define SATP64_MODE     0xF000000000000000
#define SATP64_ASID     0x0FFFF00000000000
#define SATP64_PPN      0x00000FFFFFFFFFFF
 
#define SATP_MODE_OFF   0
#define SATP_MODE_SV32  1
#define SATP_MODE_SV39  8
#define SATP_MODE_SV48  9
#define SATP_MODE_SV57  10
#define SATP_MODE_SV64  11
 
#define PMP_R           0x01
#define PMP_W           0x02
#define PMP_X           0x04
#define PMP_A           0x18
#define PMP_L           0x80
#define PMP_SHIFT       2
 
#define PMP_TOR         0x08
#define PMP_NA4         0x10
#define PMP_NAPOT       0x18
 
#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
 
/* SMRNMI CSR addresses */
#ifdef CONFIG_RISCV_SMRNMI_ENABLE_NMI_DELIVERY
#define CSR_MNSCRATCH 0x740
#define CSR_MNEPC     0x741
#define CSR_MNCAUSE   0x742
#define CSR_MNSTATUS  0x744
 
/* MNSTATUS bit fields */
#define MNSTATUS_NMIE 0x00000008 /* NMI Enable (bit 3) */
#endif                           /* CONFIG_RISCV_SMRNMI_ENABLE_NMI_DELIVERY */
 
#define DEFAULT_RSTVEC  0x00001000
#define CLINT_BASE      0x02000000
#define CLINT_SIZE      0x000c0000
#define EXT_IO_BASE     0x40000000
#define DRAM_BASE       0x80000000
 
/* page table entry (PTE) fields */
#define PTE_V           0x001 /* Valid */
#define PTE_R           0x002 /* Read */
#define PTE_W           0x004 /* Write */
#define PTE_X           0x008 /* Execute */
#define PTE_U           0x010 /* User */
#define PTE_G           0x020 /* Global */
#define PTE_A           0x040 /* Accessed */
#define PTE_D           0x080 /* Dirty */
#define PTE_SOFT        0x300 /* Reserved for Software */
 
#define PTE_PPN_SHIFT   10
 
#define PTE_TABLE(PTE) (((PTE) & (PTE_V | PTE_R | PTE_W | PTE_X)) == PTE_V)
 
#define INSERT_FIELD(val, which, fieldval)                              \
(                                                                       \
        ((val) & ~(which)) | ((fieldval) * ((which) & ~((which)-1)))    \
)                                                                       \
 
#define csr_read(csr)                                           \
({                                                              \
        register unsigned long __rv;                            \
        __asm__ volatile ("csrr %0, " STRINGIFY(csr)            \
                                : "=r" (__rv));                 \
        __rv;                                                   \
})
 
#define csr_write(csr, val)                                     \
({                                                              \
        unsigned long __wv = (unsigned long)(val);              \
        __asm__ volatile ("csrw " STRINGIFY(csr) ", %0"         \
                                : : "rK" (__wv)                 \
                                : "memory");                    \
})
 
 
#define csr_read_set(csr, val)                                  \
({                                                              \
        unsigned long __rsv = (unsigned long)(val);             \
        __asm__ volatile ("csrrs %0, " STRINGIFY(csr) ", %1"    \
                                : "=r" (__rsv) : "rK" (__rsv)   \
                                : "memory");                    \
        __rsv;                                                  \
})
 
#define csr_set(csr, val)                                       \
({                                                              \
        unsigned long __sv = (unsigned long)(val);              \
        __asm__ volatile ("csrs " STRINGIFY(csr) ", %0"         \
                                : : "rK" (__sv)                 \
                                : "memory");                    \
})
 
#define csr_read_clear(csr, val)                                \
({                                                              \
        unsigned long __rcv = (unsigned long)(val);             \
        __asm__ volatile ("csrrc %0, " STRINGIFY(csr) ", %1"    \
                                : "=r" (__rcv) : "rK" (__rcv)   \
                                : "memory");                    \
        __rcv;                                                  \
})
 
#define csr_clear(csr, val)                                     \
({                                                              \
        unsigned long __cv = (unsigned long)(val);              \
        __asm__ volatile ("csrc " STRINGIFY(csr) ", %0"         \
                                : : "rK" (__cv)                 \
                                : "memory");                    \
})
 
#ifdef CONFIG_RISCV_ISA_EXT_SMCSRIND
 
#define MISELECT 0x350
#define MIREG    0x351
#define MIREG2   0x352
#define MIREG3   0x353
#define MIREG4   0x355
#define MIREG5   0x356
#define MIREG6   0x357
 
static inline unsigned long icsr_read(unsigned int index)
{
        csr_write(MISELECT, index);
        return csr_read(MIREG);
}
 
static inline void icsr_write(unsigned int index, unsigned long value)
{
        csr_write(MISELECT, index);
        csr_write(MIREG, value);
}
 
static inline unsigned long icsr_read_set(unsigned int index, unsigned long mask)
{
        unsigned long val = icsr_read(index);
 
        icsr_write(index, val | mask);
        return val;
}
 
static inline unsigned long icsr_read_clear(unsigned int index, unsigned long mask)
{
        unsigned long val = icsr_read(index);
 
        icsr_write(index, val & ~mask);
        return val;
}
 
#endif /* CONFIG_RISCV_ISA_EXT_SMCSRIND */
 
#endif /* CSR_H_ */