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Diffstat (limited to 'target-lm32/helper.c')
| -rw-r--r-- | target-lm32/helper.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/target-lm32/helper.c b/target-lm32/helper.c new file mode 100644 index 000000000..318e2cf6e --- /dev/null +++ b/target-lm32/helper.c @@ -0,0 +1,259 @@ +/* + * LatticeMico32 helper routines. + * + * Copyright (c) 2010 Michael Walle <michael@walle.cc> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include <stdio.h> +#include <string.h> +#include <assert.h> + +#include "config.h" +#include "cpu.h" +#include "exec-all.h" +#include "host-utils.h" + +int cpu_lm32_handle_mmu_fault(CPUState *env, target_ulong address, int rw, + int mmu_idx, int is_softmmu) +{ + int prot; + + address &= TARGET_PAGE_MASK; + prot = PAGE_BITS; + if (env->flags & LM32_FLAG_IGNORE_MSB) { + tlb_set_page(env, address, address & 0x7fffffff, prot, mmu_idx, + TARGET_PAGE_SIZE); + } else { + tlb_set_page(env, address, address, prot, mmu_idx, TARGET_PAGE_SIZE); + } + + return 0; +} + +target_phys_addr_t cpu_get_phys_page_debug(CPUState *env, target_ulong addr) +{ + return addr & TARGET_PAGE_MASK; +} + +void do_interrupt(CPUState *env) +{ + qemu_log_mask(CPU_LOG_INT, + "exception at pc=%x type=%x\n", env->pc, env->exception_index); + + switch (env->exception_index) { + case EXCP_INSN_BUS_ERROR: + case EXCP_DATA_BUS_ERROR: + case EXCP_DIVIDE_BY_ZERO: + case EXCP_IRQ: + case EXCP_SYSTEMCALL: + /* non-debug exceptions */ + env->regs[R_EA] = env->pc; + env->ie |= (env->ie & IE_IE) ? IE_EIE : 0; + env->ie &= ~IE_IE; + if (env->dc & DC_RE) { + env->pc = env->deba + (env->exception_index * 32); + } else { + env->pc = env->eba + (env->exception_index * 32); + } + log_cpu_state_mask(CPU_LOG_INT, env, 0); + break; + case EXCP_BREAKPOINT: + case EXCP_WATCHPOINT: + /* debug exceptions */ + env->regs[R_BA] = env->pc; + env->ie |= (env->ie & IE_IE) ? IE_BIE : 0; + env->ie &= ~IE_IE; + if (env->dc & DC_RE) { + env->pc = env->deba + (env->exception_index * 32); + } else { + env->pc = env->eba + (env->exception_index * 32); + } + log_cpu_state_mask(CPU_LOG_INT, env, 0); + break; + default: + cpu_abort(env, "unhandled exception type=%d\n", + env->exception_index); + break; + } +} + +typedef struct { + const char *name; + uint32_t revision; + uint8_t num_interrupts; + uint8_t num_breakpoints; + uint8_t num_watchpoints; + uint32_t features; +} LM32Def; + +static const LM32Def lm32_defs[] = { + { + .name = "lm32-basic", + .revision = 3, + .num_interrupts = 32, + .num_breakpoints = 4, + .num_watchpoints = 4, + .features = (LM32_FEATURE_SHIFT + | LM32_FEATURE_SIGN_EXTEND + | LM32_FEATURE_CYCLE_COUNT), + }, + { + .name = "lm32-standard", + .revision = 3, + .num_interrupts = 32, + .num_breakpoints = 4, + .num_watchpoints = 4, + .features = (LM32_FEATURE_MULTIPLY + | LM32_FEATURE_DIVIDE + | LM32_FEATURE_SHIFT + | LM32_FEATURE_SIGN_EXTEND + | LM32_FEATURE_I_CACHE + | LM32_FEATURE_CYCLE_COUNT), + }, + { + .name = "lm32-full", + .revision = 3, + .num_interrupts = 32, + .num_breakpoints = 4, + .num_watchpoints = 4, + .features = (LM32_FEATURE_MULTIPLY + | LM32_FEATURE_DIVIDE + | LM32_FEATURE_SHIFT + | LM32_FEATURE_SIGN_EXTEND + | LM32_FEATURE_I_CACHE + | LM32_FEATURE_D_CACHE + | LM32_FEATURE_CYCLE_COUNT), + } +}; + +void cpu_lm32_list(FILE *f, fprintf_function cpu_fprintf) +{ + int i; + + cpu_fprintf(f, "Available CPUs:\n"); + for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) { + cpu_fprintf(f, " %s\n", lm32_defs[i].name); + } +} + +static const LM32Def *cpu_lm32_find_by_name(const char *name) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(lm32_defs); i++) { + if (strcasecmp(name, lm32_defs[i].name) == 0) { + return &lm32_defs[i]; + } + } + + return NULL; +} + +static uint32_t cfg_by_def(const LM32Def *def) +{ + uint32_t cfg = 0; + + if (def->features & LM32_FEATURE_MULTIPLY) { + cfg |= CFG_M; + } + + if (def->features & LM32_FEATURE_DIVIDE) { + cfg |= CFG_D; + } + + if (def->features & LM32_FEATURE_SHIFT) { + cfg |= CFG_S; + } + + if (def->features & LM32_FEATURE_SIGN_EXTEND) { + cfg |= CFG_X; + } + + if (def->features & LM32_FEATURE_I_CACHE) { + cfg |= CFG_IC; + } + + if (def->features & LM32_FEATURE_D_CACHE) { + cfg |= CFG_DC; + } + + if (def->features & LM32_FEATURE_CYCLE_COUNT) { + cfg |= CFG_CC; + } + + cfg |= (def->num_interrupts << CFG_INT_SHIFT); + cfg |= (def->num_breakpoints << CFG_BP_SHIFT); + cfg |= (def->num_watchpoints << CFG_WP_SHIFT); + cfg |= (def->revision << CFG_REV_SHIFT); + + return cfg; +} + +CPUState *cpu_lm32_init(const char *cpu_model) +{ + CPUState *env; + const LM32Def *def; + static int tcg_initialized; + + def = cpu_lm32_find_by_name(cpu_model); + if (!def) { + return NULL; + } + + env = qemu_mallocz(sizeof(CPUState)); + + env->features = def->features; + env->num_bps = def->num_breakpoints; + env->num_wps = def->num_watchpoints; + env->cfg = cfg_by_def(def); + env->flags = 0; + + cpu_exec_init(env); + cpu_reset(env); + + if (!tcg_initialized) { + tcg_initialized = 1; + lm32_translate_init(); + } + + return env; +} + +/* Some soc ignores the MSB on the address bus. Thus creating a shadow memory + * area. As a general rule, 0x00000000-0x7fffffff is cached, whereas + * 0x80000000-0xffffffff is not cached and used to access IO devices. */ +void cpu_lm32_set_phys_msb_ignore(CPUState *env, int value) +{ + if (value) { + env->flags |= LM32_FLAG_IGNORE_MSB; + } else { + env->flags &= ~LM32_FLAG_IGNORE_MSB; + } +} + +void cpu_reset(CPUState *env) +{ + if (qemu_loglevel_mask(CPU_LOG_RESET)) { + qemu_log("CPU Reset (CPU %d)\n", env->cpu_index); + log_cpu_state(env, 0); + } + + tlb_flush(env, 1); + + /* reset cpu state */ + memset(env, 0, offsetof(CPULM32State, breakpoints)); +} + |