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Add support for setting read/write map functions

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This commit is contained in:
Peter Evans 2017-12-12 14:58:06 -06:00
parent ca7e576266
commit 7da2f9e791
3 changed files with 49 additions and 0 deletions
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2
include/vm_segment.h
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@ -58,5 +58,7 @@ extern vm_segment *vm_segment_create(size_t);
extern void vm_segment_free(vm_segment *); extern void vm_segment_free(vm_segment *);
extern vm_8bit vm_segment_get(vm_segment *, size_t); extern vm_8bit vm_segment_get(vm_segment *, size_t);
extern int vm_segment_set(vm_segment *, size_t, vm_8bit); extern int vm_segment_set(vm_segment *, size_t, vm_8bit);
extern int vm_segment_read_map(vm_segment *, size_t, vm_segment_read_fn);
extern int vm_segment_write_map(vm_segment *, size_t, vm_segment_write_fn);
#endif #endif

26
src/vm_segment.c
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@ -157,3 +157,29 @@ vm_segment_copy(vm_segment *dest,
return OK; return OK;
} }
int
vm_segment_read_map(vm_segment *segment,
size_t addr,
vm_segment_read_fn fn)
{
if (addr >= segment->size) {
return ERR_OOB;
}
segment->read_table[addr] = fn;
return OK;
}
int
vm_segment_write_map(vm_segment *segment,
size_t addr,
vm_segment_write_fn fn)
{
if (addr >= segment->size) {
return ERR_OOB;
}
segment->write_table[addr] = fn;
return OK;
}

21
tests/vm_segment.c
View File

@ -72,3 +72,24 @@ Test(vm_segment, copy) {
vm_segment_free(src); vm_segment_free(src);
vm_segment_free(dest); vm_segment_free(dest);
} }
Test(vm_segment, read_map)
{
// We use some trickery here; I don't want to go to the trouble of
// defining a function for this test, so I am just passing in an
// arbitrary pointer to junk. As long as the garbage-in, garbage-out
// principle holds, we're golden.
cr_assert_eq(vm_segment_read_map(segment, 123, (vm_segment_read_fn)456), OK);
cr_assert_eq(vm_segment_read_map(segment, 321, (vm_segment_read_fn)456), ERR_OOB);
cr_assert_eq(segment->read_table[123], (vm_segment_read_fn)456);
}
Test(vm_segment, write_map)
{
// See the read_map test for more details on the following trickery
cr_assert_eq(vm_segment_write_map(segment, 123, (vm_segment_write_fn)456), OK);
cr_assert_eq(vm_segment_write_map(segment, 321, (vm_segment_write_fn)456), ERR_OOB);
cr_assert_eq(segment->write_table[123], (vm_segment_write_fn)456);
}