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target/avr: Move cpu register accesses into system memory

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Integrate the i/o 0x00-0x1f and 0x38-0x3f loopbacks into
the cpu registers with normal address space accesses.
We no longer need to trap accesses to the first page within
avr_cpu_tlb_fill but can wait until a write occurs.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2025-03-21 17:14:27 -07:00
parent a2860ff908
commit 204a7bd856
5 changed files with 138 additions and 153 deletions
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16
target/avr/cpu.c
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@ -23,6 +23,7 @@
#include "qemu/qemu-print.h"
#include "exec/exec-all.h"
#include "exec/translation-block.h"
#include "exec/address-spaces.h"
#include "cpu.h"
#include "disas/dis-asm.h"
#include "tcg/debug-assert.h"
@ -110,6 +111,8 @@ static void avr_cpu_disas_set_info(CPUState *cpu, disassemble_info *info)
static void avr_cpu_realizefn(DeviceState *dev, Error **errp)
{
CPUState *cs = CPU(dev);
CPUAVRState *env = cpu_env(cs);
AVRCPU *cpu = env_archcpu(env);
AVRCPUClass *mcc = AVR_CPU_GET_CLASS(dev);
Error *local_err = NULL;
@ -122,6 +125,19 @@ static void avr_cpu_realizefn(DeviceState *dev, Error **errp)
cpu_reset(cs);
mcc->parent_realize(dev, errp);
/*
* Two blocks in the low data space loop back into cpu registers.
*/
memory_region_init_io(&cpu->cpu_reg1, OBJECT(cpu), &avr_cpu_reg1, env,
"avr-cpu-reg1", 32);
memory_region_add_subregion(get_system_memory(),
OFFSET_DATA, &cpu->cpu_reg1);
memory_region_init_io(&cpu->cpu_reg2, OBJECT(cpu), &avr_cpu_reg2, env,
"avr-cpu-reg2", 8);
memory_region_add_subregion(get_system_memory(),
OFFSET_DATA + 0x58, &cpu->cpu_reg2);
}
static void avr_cpu_set_int(void *opaque, int irq, int level)