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hw/mips: implement ITC Storage - Bypass View

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Bypass View does not cause issuing thread to block and does not affect
any of the cells state bit.

Read from a FIFO cell returns the value of the oldest entry.
Store to a FIFO cell changes the value of the newest entry.

Signed-off-by: Leon Alrae <leon.alrae@imgtec.com>
This commit is contained in:
Leon Alrae 2016-03-25 13:49:34 +00:00
parent 40dc9dc339
commit 25a611e3e4
1 changed files with 27 additions and 0 deletions
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27
hw/misc/mips_itu.c
View File

@ -182,6 +182,27 @@ static void QEMU_NORETURN block_thread_and_exit(ITCStorageCell *c)
cpu_loop_exit(current_cpu);
}
/* ITC Bypass View */
static inline uint64_t view_bypass_read(ITCStorageCell *c)
{
if (c->tag.FIFO) {
return c->data[c->fifo_out];
} else {
return c->data[0];
}
}
static inline void view_bypass_write(ITCStorageCell *c, uint64_t val)
{
if (c->tag.FIFO && (c->tag.FIFOPtr > 0)) {
int idx = (c->fifo_out + c->tag.FIFOPtr - 1) % ITC_CELL_DEPTH;
c->data[idx] = val;
}
/* ignore a write to the semaphore cell */
}
/* ITC Control View */
static inline uint64_t view_control_read(ITCStorageCell *c)
@ -348,6 +369,9 @@ static uint64_t itc_storage_read(void *opaque, hwaddr addr, unsigned size)
uint64_t ret = -1;
switch (view) {
case ITCVIEW_BYPASS:
ret = view_bypass_read(cell);
break;
case ITCVIEW_CONTROL:
ret = view_control_read(cell);
break;
@ -380,6 +404,9 @@ static void itc_storage_write(void *opaque, hwaddr addr, uint64_t data,
ITCView view = get_itc_view(addr);
switch (view) {
case ITCVIEW_BYPASS:
view_bypass_write(cell, data);
break;
case ITCVIEW_CONTROL:
view_control_write(cell, data);
break;