Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 145 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mach-malta/kernel-entry-init.h b/arch/mips/include/asm/mach-malta/kernel-entry-init.h
new file mode 100644
index 000000000..ab03eb3fa
--- /dev/null
+++ b/arch/mips/include/asm/mach-malta/kernel-entry-init.h
@@ -0,0 +1,145 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Chris Dearman (chris@mips.com)
+ * Copyright (C) 2007 Mips Technologies, Inc.
+ * Copyright (C) 2014 Imagination Technologies Ltd.
+ */
+#ifndef __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
+#define __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H
+
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+
+	/*
+	 * Prepare segments for EVA boot:
+	 *
+	 * This is in case the processor boots in legacy configuration
+	 * (SI_EVAReset is de-asserted and CONFIG5.K == 0)
+	 *
+	 * ========================= Mappings =============================
+	 * Virtual memory           Physical memory           Mapping
+	 * 0x00000000 - 0x7fffffff  0x80000000 - 0xfffffffff   MUSUK (kuseg)
+	 *                          Flat 2GB physical memory
+	 *
+	 * 0x80000000 - 0x9fffffff  0x00000000 - 0x1ffffffff   MUSUK (kseg0)
+	 * 0xa0000000 - 0xbf000000  0x00000000 - 0x1ffffffff   MUSUK (kseg1)
+	 * 0xc0000000 - 0xdfffffff             -                 MK  (kseg2)
+	 * 0xe0000000 - 0xffffffff             -                 MK  (kseg3)
+	 *
+	 *
+	 * Lowmem is expanded to 2GB
+	 *
+	 * The following code uses the t0, t1, t2 and ra registers without
+	 * previously preserving them.
+	 *
+	 */
+	.macro	platform_eva_init
+
+	.set	push
+	.set	reorder
+	/*
+	 * Get Config.K0 value and use it to program
+	 * the segmentation registers
+	 */
+	mfc0    t1, CP0_CONFIG
+	andi	t1, 0x7 /* CCA */
+	move	t2, t1
+	ins	t2, t1, 16, 3
+	/* SegCtl0 */
+	li      t0, ((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) |		\
+		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
+		(((MIPS_SEGCFG_MK << MIPS_SEGCFG_AM_SHIFT) |		\
+		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
+	or	t0, t2
+	mtc0	t0, CP0_SEGCTL0
+
+	/* SegCtl1 */
+	li      t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |	\
+		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(2 << MIPS_SEGCFG_C_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
+		(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |		\
+		(0 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
+	ins	t0, t1, 16, 3
+	mtc0	t0, CP0_SEGCTL1
+
+	/* SegCtl2 */
+	li	t0, ((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |	\
+		(6 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) |				\
+		(((MIPS_SEGCFG_MUSUK << MIPS_SEGCFG_AM_SHIFT) |		\
+		(4 << MIPS_SEGCFG_PA_SHIFT) |				\
+		(1 << MIPS_SEGCFG_EU_SHIFT)) << 16)
+	or	t0, t2
+	mtc0	t0, CP0_SEGCTL2
+
+	jal	mips_ihb
+	mfc0    t0, $16, 5
+	li      t2, 0x40000000      /* K bit */
+	or      t0, t0, t2
+	mtc0    t0, $16, 5
+	sync
+	jal	mips_ihb
+
+	.set	pop
+	.endm
+
+	.macro	kernel_entry_setup
+
+#ifdef CONFIG_EVA
+	sync
+	ehb
+
+	mfc0    t1, CP0_CONFIG
+	bgez    t1, 9f
+	mfc0	t0, CP0_CONFIG, 1
+	bgez	t0, 9f
+	mfc0	t0, CP0_CONFIG, 2
+	bgez	t0, 9f
+	mfc0	t0, CP0_CONFIG, 3
+	sll     t0, t0, 6   /* SC bit */
+	bgez    t0, 9f
+
+	platform_eva_init
+	b       0f
+9:
+	/* Assume we came from YAMON... */
+	PTR_LA	v0, 0x9fc00534	/* YAMON print */
+	lw	v0, (v0)
+	move	a0, zero
+	PTR_LA  a1, nonsc_processor
+	jal	v0
+
+	PTR_LA	v0, 0x9fc00520	/* YAMON exit */
+	lw	v0, (v0)
+	li	a0, 1
+	jal	v0
+
+1:	b	1b
+	nop
+	__INITDATA
+nonsc_processor:
+	.asciz  "EVA kernel requires a MIPS core with Segment Control implemented\n"
+	__FINIT
+#endif /* CONFIG_EVA */
+0:
+	.endm
+
+/*
+ * Do SMP slave processor setup necessary before we can safely execute C code.
+ */
+	.macro	smp_slave_setup
+#ifdef CONFIG_EVA
+	sync
+	ehb
+	platform_eva_init
+#endif
+	.endm
+
+#endif /* __ASM_MACH_MIPS_KERNEL_ENTRY_INIT_H */