diff mbox series

[v4,3/8] platform: generic: mips: add an entry function

Message ID 20250429232928.6499-4-cfu@mips.com
State New
Headers show
Series None | expand

Commit Message

Chao-ying Fu April 29, 2025, 11:29 p.m. UTC 
The entry function is minimum boot code for harts to execute after
reset, nmi, cache error, and debug exception.

Signed-off-by: Chao-ying Fu <cfu@mips.com>
---
 platform/generic/mips/cps-vec.S | 75 +++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 platform/generic/mips/cps-vec.S
diff mbox series

Patch

diff --git a/platform/generic/mips/cps-vec.S b/platform/generic/mips/cps-vec.S
new file mode 100644
index 0000000..9309e20
--- /dev/null
+++ b/platform/generic/mips/cps-vec.S
@@ -0,0 +1,75 @@ 
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2025 MIPS
+ *
+ */
+
+#include <sbi/riscv_encoding.h>
+#include <mips/p8700.h>
+
+	.text
+	.align	12
+	.globl	mips_cps_core_entry
+mips_cps_core_entry:
+	j	1f
+
+	.align	2
+nmi_vector:
+	j	1f
+
+	.align	2
+cacheerr_vector:
+	j	1f
+
+	.align	2
+debugexc_vector:
+	j	1f
+
+	.align	2
+1:
+	li	x1, 0
+	li	x2, 0
+	li	x3, 0
+	li	x4, 0
+	li	x5, 0
+	li	x6, 0
+	li	x7, 0
+	li	x8, 0
+	li	x9, 0
+	li	x10, 0
+#ifdef FW_FDT_PATH
+	li	x11, 0
+#endif
+	li	x12, 0
+	li	x13, 0
+	li	x14, 0
+	li	x15, 0
+	li	x16, 0
+	li	x17, 0
+	li	x18, 0
+	li	x19, 0
+	li	x20, 0
+	li	x21, 0
+	li	x22, 0
+	li	x23, 0
+	li	x24, 0
+	li	x25, 0
+	li	x26, 0
+	li	x27, 0
+	li	x28, 0
+	li	x29, 0
+	li	x30, 0
+	li	x31, 0
+
+	/* a0 has mhartid */
+	csrr	a0, CSR_MHARTID
+
+	/* Let hart 0 jump to _start */
+	beqz	a0, 1f
+	lla	t0, _start_warm
+	jr	t0
+1:
+	lla	t0, _start
+	jr	t0
+