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target/loongarch: Add LoongArch IOCSR instruction

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This includes:
- IOCSR{RD/WR}.{B/H/W/D}

Signed-off-by: Xiaojuan Yang <yangxiaojuan@loongson.cn>
Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220606124333.2060567-27-yangxiaojuan@loongson.cn>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Xiaojuan Yang 2022-06-06 20:43:16 +08:00 committed by Richard Henderson
parent 5b1dedfe84
commit f84a2aacf5
8 changed files with 197 additions and 0 deletions
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44
target/loongarch/cpu.c
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@ -17,6 +17,8 @@
#include "internals.h"
#include "fpu/softfloat-helpers.h"
#include "cpu-csr.h"
#include "sysemu/reset.h"
#include "hw/loader.h"
const char * const regnames[32] = {
"r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
@ -489,14 +491,56 @@ static void loongarch_cpu_realizefn(DeviceState *dev, Error **errp)
lacc->parent_realize(dev, errp);
}
static void loongarch_qemu_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
}
static uint64_t loongarch_qemu_read(void *opaque, hwaddr addr, unsigned size)
{
switch (addr) {
case FEATURE_REG:
return 1ULL << IOCSRF_MSI | 1ULL << IOCSRF_EXTIOI |
1ULL << IOCSRF_CSRIPI;
case VENDOR_REG:
return 0x6e6f73676e6f6f4cULL; /* "Loongson" */
case CPUNAME_REG:
return 0x303030354133ULL; /* "3A5000" */
case MISC_FUNC_REG:
return 1ULL << IOCSRM_EXTIOI_EN;
}
return 0ULL;
}
static const MemoryRegionOps loongarch_qemu_ops = {
.read = loongarch_qemu_read,
.write = loongarch_qemu_write,
.endianness = DEVICE_LITTLE_ENDIAN,
.valid = {
.min_access_size = 4,
.max_access_size = 8,
},
.impl = {
.min_access_size = 8,
.max_access_size = 8,
},
};
static void loongarch_cpu_init(Object *obj)
{
LoongArchCPU *cpu = LOONGARCH_CPU(obj);
CPULoongArchState *env = &cpu->env;
cpu_set_cpustate_pointers(cpu);
qdev_init_gpio_in(DEVICE(cpu), loongarch_cpu_set_irq, N_IRQS);
timer_init_ns(&cpu->timer, QEMU_CLOCK_VIRTUAL,
&loongarch_constant_timer_cb, cpu);
memory_region_init_io(&env->system_iocsr, OBJECT(cpu), NULL,
env, "iocsr", UINT64_MAX);
address_space_init(&env->address_space_iocsr, &env->system_iocsr, "IOCSR");
memory_region_init_io(&env->iocsr_mem, OBJECT(cpu), &loongarch_qemu_ops,
NULL, "iocsr_misc", 0x428);
memory_region_add_subregion(&env->system_iocsr, 0, &env->iocsr_mem);
}
static ObjectClass *loongarch_cpu_class_by_name(const char *cpu_model)

25
target/loongarch/cpu.h
View File

@ -12,6 +12,27 @@
#include "fpu/softfloat-types.h"
#include "hw/registerfields.h"
#include "qemu/timer.h"
#include "exec/memory.h"
#include "hw/sysbus.h"
#define IOCSRF_TEMP 0
#define IOCSRF_NODECNT 1
#define IOCSRF_MSI 2
#define IOCSRF_EXTIOI 3
#define IOCSRF_CSRIPI 4
#define IOCSRF_FREQCSR 5
#define IOCSRF_FREQSCALE 6
#define IOCSRF_DVFSV1 7
#define IOCSRF_GMOD 9
#define IOCSRF_VM 11
#define FEATURE_REG 0x8
#define VENDOR_REG 0x10
#define CPUNAME_REG 0x20
#define MISC_FUNC_REG 0x420
#define IOCSRM_EXTIOI_EN 48
#define IOCSR_MEM_SIZE 0x428
#define TCG_GUEST_DEFAULT_MO (0)
@ -283,6 +304,10 @@ typedef struct CPUArchState {
uint64_t CSR_DSAVE;
LoongArchTLB tlb[LOONGARCH_TLB_MAX];
AddressSpace address_space_iocsr;
MemoryRegion system_iocsr;
MemoryRegion iocsr_mem;
} CPULoongArchState;
/**

8
target/loongarch/disas.c
View File

@ -615,6 +615,14 @@ INSN(bgeu, rr_offs)
INSN(csrrd, r_csr)
INSN(csrwr, r_csr)
INSN(csrxchg, rr_csr)
INSN(iocsrrd_b, rr)
INSN(iocsrrd_h, rr)
INSN(iocsrrd_w, rr)
INSN(iocsrrd_d, rr)
INSN(iocsrwr_b, rr)
INSN(iocsrwr_h, rr)
INSN(iocsrwr_w, rr)
INSN(iocsrwr_d, rr)
#define output_fcmp(C, PREFIX, SUFFIX) \
{ \

8
target/loongarch/helper.h
View File

@ -100,3 +100,11 @@ DEF_HELPER_2(csrwr_estat, i64, env, tl)
DEF_HELPER_2(csrwr_asid, i64, env, tl)
DEF_HELPER_2(csrwr_tcfg, i64, env, tl)
DEF_HELPER_2(csrwr_ticlr, i64, env, tl)
DEF_HELPER_2(iocsrrd_b, i64, env, tl)
DEF_HELPER_2(iocsrrd_h, i64, env, tl)
DEF_HELPER_2(iocsrrd_w, i64, env, tl)
DEF_HELPER_2(iocsrrd_d, i64, env, tl)
DEF_HELPER_3(iocsrwr_b, void, env, tl, tl)
DEF_HELPER_3(iocsrwr_h, void, env, tl, tl)
DEF_HELPER_3(iocsrwr_w, void, env, tl, tl)
DEF_HELPER_3(iocsrwr_d, void, env, tl, tl)

35
target/loongarch/insn_trans/trans_privileged.c.inc
View File

@ -262,3 +262,38 @@ static bool trans_csrxchg(DisasContext *ctx, arg_csrxchg *a)
tcg_temp_free(oldv);
return true;
}
static bool gen_iocsrrd(DisasContext *ctx, arg_rr *a,
void (*func)(TCGv, TCGv_ptr, TCGv))
{
TCGv dest = gpr_dst(ctx, a->rd, EXT_NONE);
TCGv src1 = gpr_src(ctx, a->rj, EXT_NONE);
if (check_plv(ctx)) {
return false;
}
func(dest, cpu_env, src1);
return true;
}
static bool gen_iocsrwr(DisasContext *ctx, arg_rr *a,
void (*func)(TCGv_ptr, TCGv, TCGv))
{
TCGv val = gpr_src(ctx, a->rd, EXT_NONE);
TCGv addr = gpr_src(ctx, a->rj, EXT_NONE);
if (check_plv(ctx)) {
return false;
}
func(cpu_env, addr, val);
return true;
}
TRANS(iocsrrd_b, gen_iocsrrd, gen_helper_iocsrrd_b)
TRANS(iocsrrd_h, gen_iocsrrd, gen_helper_iocsrrd_h)
TRANS(iocsrrd_w, gen_iocsrrd, gen_helper_iocsrrd_w)
TRANS(iocsrrd_d, gen_iocsrrd, gen_helper_iocsrrd_d)
TRANS(iocsrwr_b, gen_iocsrwr, gen_helper_iocsrwr_b)
TRANS(iocsrwr_h, gen_iocsrwr, gen_helper_iocsrwr_h)
TRANS(iocsrwr_w, gen_iocsrwr, gen_helper_iocsrwr_w)
TRANS(iocsrwr_d, gen_iocsrwr, gen_helper_iocsrwr_d)

9
target/loongarch/insns.decode
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@ -450,3 +450,12 @@ bgeu 0110 11 ................ ..... ..... @rr_offs16
csrwr 0000 0100 .............. 00001 ..... @r_csr
csrxchg 0000 0100 .............. ..... ..... @rr_csr
}
iocsrrd_b 0000 01100100 10000 00000 ..... ..... @rr
iocsrrd_h 0000 01100100 10000 00001 ..... ..... @rr
iocsrrd_w 0000 01100100 10000 00010 ..... ..... @rr
iocsrrd_d 0000 01100100 10000 00011 ..... ..... @rr
iocsrwr_b 0000 01100100 10000 00100 ..... ..... @rr
iocsrwr_h 0000 01100100 10000 00101 ..... ..... @rr
iocsrwr_w 0000 01100100 10000 00110 ..... ..... @rr
iocsrwr_d 0000 01100100 10000 00111 ..... ..... @rr

67
target/loongarch/iocsr_helper.c Normal file
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@ -0,0 +1,67 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* Copyright (c) 2021 Loongson Technology Corporation Limited
*
* Helpers for IOCSR reads/writes
*/
#include "qemu/osdep.h"
#include "qemu/main-loop.h"
#include "cpu.h"
#include "qemu/host-utils.h"
#include "exec/helper-proto.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
#include "tcg/tcg-ldst.h"
uint64_t helper_iocsrrd_b(CPULoongArchState *env, target_ulong r_addr)
{
return address_space_ldub(&env->address_space_iocsr, r_addr,
MEMTXATTRS_UNSPECIFIED, NULL);
}
uint64_t helper_iocsrrd_h(CPULoongArchState *env, target_ulong r_addr)
{
return address_space_lduw(&env->address_space_iocsr, r_addr,
MEMTXATTRS_UNSPECIFIED, NULL);
}
uint64_t helper_iocsrrd_w(CPULoongArchState *env, target_ulong r_addr)
{
return address_space_ldl(&env->address_space_iocsr, r_addr,
MEMTXATTRS_UNSPECIFIED, NULL);
}
uint64_t helper_iocsrrd_d(CPULoongArchState *env, target_ulong r_addr)
{
return address_space_ldq(&env->address_space_iocsr, r_addr,
MEMTXATTRS_UNSPECIFIED, NULL);
}
void helper_iocsrwr_b(CPULoongArchState *env, target_ulong w_addr,
target_ulong val)
{
address_space_stb(&env->address_space_iocsr, w_addr,
val, MEMTXATTRS_UNSPECIFIED, NULL);
}
void helper_iocsrwr_h(CPULoongArchState *env, target_ulong w_addr,
target_ulong val)
{
address_space_stw(&env->address_space_iocsr, w_addr,
val, MEMTXATTRS_UNSPECIFIED, NULL);
}
void helper_iocsrwr_w(CPULoongArchState *env, target_ulong w_addr,
target_ulong val)
{
address_space_stl(&env->address_space_iocsr, w_addr,
val, MEMTXATTRS_UNSPECIFIED, NULL);
}
void helper_iocsrwr_d(CPULoongArchState *env, target_ulong w_addr,
target_ulong val)
{
address_space_stq(&env->address_space_iocsr, w_addr,
val, MEMTXATTRS_UNSPECIFIED, NULL);
}

1
target/loongarch/meson.build
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@ -20,6 +20,7 @@ loongarch_softmmu_ss.add(files(
'tlb_helper.c',
'constant_timer.c',
'csr_helper.c',
'iocsr_helper.c',
))
loongarch_ss.add_all(when: 'CONFIG_TCG', if_true: [loongarch_tcg_ss])