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Add system for memory mapping a block of memory from the host.

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Toby Jaffey 2025-12-11 02:36:46 +00:00
parent 8802b4c268
commit b55c2bc88a
9 changed files with 253 additions and 1 deletions
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43
uvm32/uvm32.c
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@ -69,6 +69,10 @@ void uvm32_init(uvm32_state_t *vmst) {
UVM32_MEMSET(vmst, 0x00, sizeof(uvm32_state_t));
vmst->status = UVM32_STATUS_PAUSED;
vmst->extramLen = 0;
vmst->extram = UVM32_NULL;
vmst->extramDirty = false;
vmst->core.pc = MINIRV32_RAM_IMAGE_OFFSET;
// https://projectf.io/posts/riscv-cheat-sheet/
// setup stack pointer
@ -141,6 +145,8 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
const uint32_t min_instrs = 1;
uint32_t orig_instr_meter = instr_meter;
vmst->extramDirty = false;
if (instr_meter < min_instrs) {
instr_meter = min_instrs;
}
@ -320,3 +326,40 @@ uvm32_evt_syscall_buf_t uvm32_getbuf_fixed(uvm32_state_t *vmst, uvm32_evt_t *evt
return scb;
}
uint32_t uvm32_extramLoad(void *userdata, uint32_t addr) {
uvm32_state_t *vmst = (uvm32_state_t *)userdata;
addr -= UVM32_EXTRAM_BASE;
if (vmst->extram != UVM32_NULL) {
if (addr < vmst->extramLen) {
return ((uint32_t *)vmst->extram)[addr / 4];
} else {
setStatusErr(vmst, UVM32_ERR_MEM_RD);
}
}
return 0;
}
uint32_t uvm32_extramStore(void *userdata, uint32_t addr, uint32_t val ) {
uvm32_state_t *vmst = (uvm32_state_t *)userdata;
addr -= UVM32_EXTRAM_BASE;
if (vmst->extram != UVM32_NULL) {
if (addr < vmst->extramLen) {
((uint32_t *)vmst->extram)[addr / 4] = val;
vmst->extramDirty = true;
} else {
setStatusErr(vmst, UVM32_ERR_MEM_WR);
}
}
return 0;
}
void uvm32_extram(uvm32_state_t *vmst, uint32_t *ram, uint32_t len) {
vmst->extram = ram;
vmst->extramLen = len;
}
bool uvm32_extramDirty(uvm32_state_t *vmst) {
return vmst->extramDirty;
}