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Introduce IS_IN_ELX() macros

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The goal of these macros is to improve code readability by providing
a concise way to check whether we are running in the expected
exception level.

Change-Id: If9aebadfb6299a5196e9a582b442f0971d9909b1
This commit is contained in:
Sandrine Bailleux 2014-05-09 11:23:11 +01:00
parent 60bc4bbd0b
commit b3254e8547
3 changed files with 8 additions and 7 deletions
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7
common/bl_common.c
View File

@ -106,9 +106,7 @@ void __dead2 raise_el(aapcs64_params_t *args)
*/
void __dead2 change_el(el_change_info_t *info)
{
unsigned long current_el = read_current_el();
if (GET_EL(current_el) == MODE_EL3) {
if (IS_IN_EL3()) {
/*
* We can go anywhere from EL3. So find where.
* TODO: Lots to do if we are going non-secure.
@ -551,7 +549,6 @@ void __dead2 run_image(unsigned long entrypoint,
void *second_arg)
{
el_change_info_t run_image_info;
unsigned long current_el = read_current_el();
/* Tell next EL what we want done */
run_image_info.args.arg0 = RUN_IMAGE;
@ -565,7 +562,7 @@ void __dead2 run_image(unsigned long entrypoint,
* to jump to a higher EL and issue an SMC. Contents of argY
* will go into the general purpose register xY e.g. arg0->x0
*/
if (GET_EL(current_el) == MODE_EL3) {
if (IS_IN_EL3()) {
run_image_info.args.arg1 = (unsigned long) first_arg;
run_image_info.args.arg2 = (unsigned long) second_arg;
} else {

5
include/lib/aarch64/arch_helpers.h
View File

@ -264,5 +264,10 @@ extern void write_cpuectlr(unsigned long);
extern void write_cptr_el2(unsigned long);
extern void write_cptr_el3(unsigned long);
#define IS_IN_EL(x) \
(GET_EL(read_current_el()) == MODE_EL##x)
#define IS_IN_EL1() IS_IN_EL(1)
#define IS_IN_EL3() IS_IN_EL(3)
#endif /* __ARCH_HELPERS_H__ */

3
plat/fvp/aarch64/plat_common.c
View File

@ -52,7 +52,6 @@ static unsigned long platform_config[CONFIG_LIMIT];
void enable_mmu()
{
unsigned long mair, tcr, ttbr, sctlr;
unsigned long current_el = read_current_el();
/* Set the attributes in the right indices of the MAIR */
mair = MAIR_ATTR_SET(ATTR_DEVICE, ATTR_DEVICE_INDEX);
@ -68,7 +67,7 @@ void enable_mmu()
/* Set TTBR bits as well */
ttbr = (unsigned long) l1_xlation_table;
if (GET_EL(current_el) == MODE_EL3) {
if (IS_IN_EL3()) {
assert((read_sctlr_el3() & SCTLR_M_BIT) == 0);
write_mair_el3(mair);