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powerpc: helper functions to initialize AMR, IAMR and UAMOR registers 

Introduce  helper functions that can initialize the bits in the AMR,
IAMR and UAMOR register; the bits that correspond to the given pkey.

Reviewed-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Ram Pai 2018-01-18 17:50:27 -08:00 committed by Michael Ellerman
parent 1b4037dead
commit 4d70b698f9
1 changed files with 47 additions and 0 deletions
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47
arch/powerpc/mm/pkeys.c
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@ -12,6 +12,10 @@ bool pkey_execute_disable_supported;
int pkeys_total; /* Total pkeys as per device tree */ int pkeys_total; /* Total pkeys as per device tree */
u32 initial_allocation_mask; /* Bits set for reserved keys */ u32 initial_allocation_mask; /* Bits set for reserved keys */
#define AMR_BITS_PER_PKEY 2
#define PKEY_REG_BITS (sizeof(u64)*8)
#define pkeyshift(pkey) (PKEY_REG_BITS - ((pkey+1) * AMR_BITS_PER_PKEY))
int pkey_initialize(void) int pkey_initialize(void)
{ {
int os_reserved, i; int os_reserved, i;
@ -103,3 +107,46 @@ static inline void write_uamor(u64 value)
{ {
mtspr(SPRN_UAMOR, value); mtspr(SPRN_UAMOR, value);
} }
static inline void init_amr(int pkey, u8 init_bits)
{
u64 new_amr_bits = (((u64)init_bits & 0x3UL) << pkeyshift(pkey));
u64 old_amr = read_amr() & ~((u64)(0x3ul) << pkeyshift(pkey));
write_amr(old_amr | new_amr_bits);
}
static inline void init_iamr(int pkey, u8 init_bits)
{
u64 new_iamr_bits = (((u64)init_bits & 0x1UL) << pkeyshift(pkey));
u64 old_iamr = read_iamr() & ~((u64)(0x1ul) << pkeyshift(pkey));
write_iamr(old_iamr | new_iamr_bits);
}
static void pkey_status_change(int pkey, bool enable)
{
u64 old_uamor;
/* Reset the AMR and IAMR bits for this key */
init_amr(pkey, 0x0);
init_iamr(pkey, 0x0);
/* Enable/disable key */
old_uamor = read_uamor();
if (enable)
old_uamor |= (0x3ul << pkeyshift(pkey));
else
old_uamor &= ~(0x3ul << pkeyshift(pkey));
write_uamor(old_uamor);
}
void __arch_activate_pkey(int pkey)
{
pkey_status_change(pkey, true);
}
void __arch_deactivate_pkey(int pkey)
{
pkey_status_change(pkey, false);
}