[PATCH v2 06/12] mips: traps: Set WG bit in EBase register on Octeon

[Stefan Roese]

WG (bit 11) needs to be set on Octeon to enable writing bits 63:30 of
the exception base register.

Signed-off-by: Stefan Roese <sr at denx.de>

---

Changes in v2:
- Move bit macro definition to mipsregs.h

 arch/mips/include/asm/mipsregs.h | 1 +
 arch/mips/lib/traps.c            | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index f80311e64e..998f84d0a1 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -365,6 +365,7 @@
  * Bits in the coprocessor 0 EBase register.
  */
 #define EBASE_CPUNUM		0x3ff
+#define EBASE_WG		(_ULCAST_(1) << 11)
 
 /*
  * Bits in the coprocessor 0 config register.
diff --git a/arch/mips/lib/traps.c b/arch/mips/lib/traps.c
index 8fff7541e3..dfef97dce3 100644
--- a/arch/mips/lib/traps.c
+++ b/arch/mips/lib/traps.c
@@ -106,6 +106,10 @@ void trap_init(ulong reloc_addr)
 
 	saved_ebase = read_c0_ebase() & 0xfffff000;
 
+	/* Set WG bit on Octeon to enable writing to bits 63:30 */
+	if (IS_ENABLED(CONFIG_ARCH_OCTEON))
+		ebase |= EBASE_WG;
+
 	write_c0_ebase(ebase);
 	clear_c0_status(ST0_BEV);
 	execution_hazard_barrier();
-- 
2.26.2