mirror of
https://github.com/ringtailsoftware/uvm32.git
synced 2026-06-05 22:43:39 +00:00
Rework host/target interface to use ecall and proper syscalls instead of CSRs
This commit is contained in:
Toby Jaffey
parent
a305fce466
commit
751f068486
26 changed files with 360 additions and 364 deletions
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@ -24,7 +24,7 @@ static void setup_err_evt(uvm32_state_t *vmst, uvm32_evt_t *evt) {
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static void setStatus(uvm32_state_t *vmst, uvm32_status_t newStatus) {
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if (vmst->status == UVM32_STATUS_ERROR) {
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// always stay in error state until a uvm32_reset()
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// always stay in error state until a uvm32_init()
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return;
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} else {
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vmst->status = newStatus;
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@ -47,7 +47,7 @@ void uvm32_init(uvm32_state_t *vmst, const uvm32_mapping_t *mappings, uint32_t n
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// setup stack pointer
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// la sp, _sstack
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// addi sp,sp,-16
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vmst->core->regs[2] = (MINIRV32_RAM_IMAGE_OFFSET + UVM32_MEMORY_SIZE) - 16;
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vmst->core->regs[2] = (MINIRV32_RAM_IMAGE_OFFSET + UVM32_MEMORY_SIZE - sizeof(struct MiniRV32IMAState)) - 16;
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vmst->core->regs[10] = 0x00; //hart ID
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vmst->core->regs[11] = 0;
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vmst->core->extraflags |= 3; // Machine-mode.
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@ -67,8 +67,45 @@ bool uvm32_load(uvm32_state_t *vmst, uint8_t *rom, int len) {
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return true;
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}
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// Read C-string up to terminator and return len,ptr
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static void get_safeptr_terminated(uvm32_state_t *vmst, uint32_t addr, uint8_t terminator, uvm32_evt_ioreq_buf_t *buf) {
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uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
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uint32_t p = ptrstart;
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if (p >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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buf->ptr = NULL;
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buf->len = 0;
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return;
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}
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while(vmst->memory[p] != terminator) {
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p++;
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if (p >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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buf->ptr = NULL;
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buf->len = 0;
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return;
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}
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}
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buf->ptr = &vmst->memory[ptrstart];
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buf->len = p - ptrstart;
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}
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#if 0
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static void get_safeptr(uvm32_state_t *vmst, uint32_t addr, uint32_t len, uvm32_evt_ioreq_buf_t *buf) {
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uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
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if (ptrstart + len >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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}
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buf->ptr = &vmst->memory[ptrstart];
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buf->len = len;
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}
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#endif
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uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter) {
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uint32_t num_instr = 0;
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// uvm32_evt_ioreq_buf_t b;
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if (vmst->status != UVM32_STATUS_PAUSED) {
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setStatusErr(vmst, UVM32_ERR_NOTREADY);
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setup_err_evt(vmst, evt);
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@ -80,7 +117,65 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
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// run CPU until no longer in running state
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while(vmst->status == UVM32_STATUS_RUNNING) {
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uint64_t elapsedUs = 1;
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if (0 != MiniRV32IMAStep(vmst, vmst->core, vmst->memory, 0, elapsedUs, 1)) {
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uint32_t ret;
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ret = MiniRV32IMAStep(vmst, vmst->core, vmst->memory, 0, elapsedUs, 1);
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if (3 == ret) {
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const uint32_t syscall = vmst->core->regs[17]; // a7
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uint32_t value = vmst->core->regs[10]; // a0
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bool syscall_valid = false;
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// on exception we should jump to mtvec, but we handle directly
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// and skip over the ecall instruction
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vmst->core->pc += 4;
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switch(syscall) {
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// inbuilt syscalls
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case IOREQ_HALT:
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setStatus(vmst, UVM32_STATUS_ENDED);
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syscall_valid = true;
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break;
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case IOREQ_YIELD:
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vmst->ioevt.typ = UVM32_EVT_YIELD;
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setStatus(vmst, UVM32_STATUS_PAUSED);
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syscall_valid = true;
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break;
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// user defined syscalls
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default:
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// search in mappings
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for (int i=0;i<vmst->numMappings;i++) {
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if (syscall == vmst->mappings[i].syscall) {
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// setup ioevt.data according to mapping typ
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switch(vmst->mappings[i].typ) {
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case IOREQ_TYP_VOID:
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break;
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case IOREQ_TYP_U32_WR:
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vmst->ioevt.data.ioreq.val.u32 = value;
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break;
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case IOREQ_TYP_BUF_TERMINATED_WR:
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get_safeptr_terminated(vmst, value, 0x00, &vmst->ioevt.data.ioreq.val.buf);
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break;
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case IOREQ_TYP_U32_RD:
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// get_safeptr(vmst, value, 4, &b);
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vmst->ioevt.data.ioreq.val.u32p = &vmst->core->regs[11]; // r1, //(uint32_t *)b.ptr;
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break;
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}
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vmst->ioevt.typ = UVM32_EVT_IOREQ;
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vmst->ioevt.data.ioreq.code = vmst->mappings[i].code;
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vmst->ioevt.data.ioreq.typ = vmst->mappings[i].typ;
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//#warning FIXME, retval
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// vmst->core->regs[11] = 456; // r1
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setStatus(vmst, UVM32_STATUS_PAUSED);
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syscall_valid = true;
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break; // stop searching
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}
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}
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// no mapping found
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if (!syscall_valid) {
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setStatusErr(vmst, UVM32_ERR_BAD_SYSCALL);
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}
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break;
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}
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} else if (ret != 0) {
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// unhandled exception
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setStatusErr(vmst, UVM32_ERR_INTERNAL_CORE);
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setup_err_evt(vmst, evt);
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}
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@ -116,83 +211,6 @@ uint32_t uvm32_run(uvm32_state_t *vmst, uvm32_evt_t *evt, uint32_t instr_meter)
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}
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}
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// Read C-string up to terminator and return len,ptr
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static void get_safeptr_terminated(uvm32_state_t *vmst, uint32_t addr, uint8_t terminator, uvm32_evt_ioreq_buf_t *buf) {
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uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
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uint32_t p = ptrstart;
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if (p >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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buf->ptr = NULL;
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buf->len = 0;
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return;
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}
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while(vmst->memory[p] != terminator) {
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p++;
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if (p >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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buf->ptr = NULL;
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buf->len = 0;
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return;
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}
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}
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buf->ptr = &vmst->memory[ptrstart];
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buf->len = p - ptrstart;
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}
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static void get_safeptr(uvm32_state_t *vmst, uint32_t addr, uint32_t len, uvm32_evt_ioreq_buf_t *buf) {
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uint32_t ptrstart = addr - MINIRV32_RAM_IMAGE_OFFSET;
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if (ptrstart + len >= UVM32_MEMORY_SIZE) {
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setStatusErr(vmst, UVM32_ERR_MEM_RD);
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}
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buf->ptr = &vmst->memory[ptrstart];
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buf->len = len;
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}
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void uvm32_HandleOtherCSRWrite(void *userdata, uint16_t csrno, uint32_t value) {
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uvm32_evt_ioreq_buf_t b;
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uvm32_state_t *vmst = (uvm32_state_t *)userdata;
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switch(csrno) {
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case IOREQ_HALT:
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setStatus(vmst, UVM32_STATUS_ENDED);
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break;
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case IOREQ_YIELD:
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vmst->ioevt.typ = UVM32_EVT_YIELD;
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setStatus(vmst, UVM32_STATUS_PAUSED);
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break;
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default:
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// search in mappings
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for (int i=0;i<vmst->numMappings;i++) {
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if (csrno == vmst->mappings[i].csr) {
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// setup ioevt.data according to mapping typ
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switch(vmst->mappings[i].typ) {
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case IOREQ_TYP_VOID:
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break;
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case IOREQ_TYP_U32_WR:
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vmst->ioevt.data.ioreq.val.u32 = value;
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break;
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case IOREQ_TYP_BUF_TERMINATED_WR:
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get_safeptr_terminated(vmst, value, 0x00, &vmst->ioevt.data.ioreq.val.buf);
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break;
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case IOREQ_TYP_U32_RD:
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get_safeptr(vmst, value, 4, &b);
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vmst->ioevt.data.ioreq.val.u32p = (uint32_t *)b.ptr;
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break;
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}
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vmst->ioevt.typ = UVM32_EVT_IOREQ;
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vmst->ioevt.data.ioreq.code = vmst->mappings[i].code;
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vmst->ioevt.data.ioreq.typ = vmst->mappings[i].typ;
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setStatus(vmst, UVM32_STATUS_PAUSED);
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return;
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}
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}
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// no mapping found
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setStatusErr(vmst, UVM32_ERR_BAD_CSR);
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break;
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}
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}
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bool uvm32_hasEnded(const uvm32_state_t *vmst) {
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return vmst->status == UVM32_STATUS_ENDED;
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}
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