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arm: Introduce current_pl() on ARM32 and compatibility current_el()

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The ARM32 has PLx Privilege Levels instead of Exception Levels present
on ARM64. Introduce current_pl() function which reports the current PL
on ARM32.

Introduce current_el() for ARM32 as well and current_pl() for ARM64
which each call the other matching function. This is mainly mean to
allow code like this to compile and retain compile time code coverage:

if (IS_ENABLED(CONFIG_ARM64) && current_el() != 3) { ... }
if (!IS_ENABLED(CONFIG_ARM64) && current_pl() != 0) { ... }

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
This commit is contained in:
Marek Vasut 2026-03-16 00:50:33 +01:00 committed by Tom Rini
parent b5517950e6
commit c3c082aa43
1 changed files with 39 additions and 0 deletions
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39
arch/arm/include/asm/system.h
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@ -171,6 +171,12 @@ static inline unsigned int current_el(void)
return 3 & (el >> 2);
}
static inline unsigned int current_pl(void)
{
/* Aarch32 compatibility */
return current_el();
};
static inline unsigned long get_sctlr(void)
{
unsigned int el;
@ -466,6 +472,39 @@ static inline int is_hyp(void)
#endif
}
static inline int is_usr(void)
{
return (get_cpsr() & 0x1f) == 0x10;
}
static inline unsigned int current_pl(void)
{
/*
* ARM DDI 0406C.d ID040418 , page 140 chapter A3.6.1 "Processor
* privilege levels, execution privilege, and access privilege",
* clarifies the PLx levels as follows (abbreviated):
* The characteristics of the privilege levels are:
* - PL0 - The privilege level of application software, that
* executes in User mode.
* - PL1 - Software execution in all modes other than User mode
* and Hyp mode is at PL1.
* - PL2 - Software executing in Hyp mode executes at PL2.
*/
if (is_hyp()) /* HYP */
return 2;
if (is_usr()) /* USR */
return 0;
return 1; /* The rest */
}
static inline unsigned int current_el(void)
{
/* Aarch64 compatibility */
return current_pl();
};
static inline unsigned int get_cr(void)
{
unsigned int val;