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xlat lib: Don't set mmap_attr_t enum to be -1

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-1 is not a defined mmap_attr_t type. Instead of using invalid enum
types, we can either choose to define a INVALID type OR handle the
condition specifically.

Since the usage of mmap_region_attr is limited, it is easier to just
handle the error condition specifically and return 0 or -1 depending
on success or fail.

Fixes: ARM-Software/tf-issues#473
Fixes: 28fa2e9ee8 ("xlat lib: Use mmap_attr_t type consistently")

Signed-off-by: Nishanth Menon <nm@ti.com>
This commit is contained in:
Nishanth Menon 2017-05-01 12:26:34 -05:00
parent dd454b40df
commit 7055e6fa32
1 changed files with 20 additions and 13 deletions
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33
lib/xlat_tables/xlat_tables_common.c
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@ -273,15 +273,19 @@ static uint64_t mmap_desc(mmap_attr_t attr, unsigned long long addr_pa,
}
/*
* Returns attributes of area at `base_va` with size `size`. It returns the
* attributes of the innermost region that contains it. If there are partial
* overlaps, it returns -1, as a smaller size is needed.
* Look for the innermost region that contains the area at `base_va` with size
* `size`. Populate *attr with the attributes of this region.
*
* On success, this function returns 0.
* If there are partial overlaps (meaning that a smaller size is needed) or if
* the region can't be found in the given area, it returns -1. In this case the
* value pointed by attr should be ignored by the caller.
*/
static mmap_attr_t mmap_region_attr(mmap_region_t *mm, uintptr_t base_va,
size_t size)
static int mmap_region_attr(mmap_region_t *mm, uintptr_t base_va,
size_t size, mmap_attr_t *attr)
{
/* Don't assume that the area is contained in the first region */
mmap_attr_t attr = -1;
int ret = -1;
/*
* Get attributes from last (innermost) region that contains the
@ -301,23 +305,25 @@ static mmap_attr_t mmap_region_attr(mmap_region_t *mm, uintptr_t base_va,
for (;; ++mm) {
if (!mm->size)
return attr; /* Reached end of list */
return ret; /* Reached end of list */
if (mm->base_va > base_va + size - 1)
return attr; /* Next region is after area so end */
return ret; /* Next region is after area so end */
if (mm->base_va + mm->size - 1 < base_va)
continue; /* Next region has already been overtaken */
if (mm->attr == attr)
if (!ret && mm->attr == *attr)
continue; /* Region doesn't override attribs so skip */
if (mm->base_va > base_va ||
mm->base_va + mm->size - 1 < base_va + size - 1)
return -1; /* Region doesn't fully cover our area */
attr = mm->attr;
*attr = mm->attr;
ret = 0;
}
return ret;
}
static mmap_region_t *init_xlation_table_inner(mmap_region_t *mm,
@ -360,9 +366,10 @@ static mmap_region_t *init_xlation_table_inner(mmap_region_t *mm,
* there are partially overlapping regions. On success,
* it will return the innermost region's attributes.
*/
mmap_attr_t attr = mmap_region_attr(mm, base_va,
level_size);
if (attr >= 0) {
mmap_attr_t attr;
int r = mmap_region_attr(mm, base_va, level_size, &attr);
if (!r) {
desc = mmap_desc(attr,
base_va - mm->base_va + mm->base_pa,
level);