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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/mips/include/asm/mach-ip27/kernel-entry-init.h
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/mips/include/asm/mach-ip27/kernel-entry-init.h')
-rw-r--r--arch/mips/include/asm/mach-ip27/kernel-entry-init.h96
1 files changed, 96 insertions, 0 deletions
diff --git a/arch/mips/include/asm/mach-ip27/kernel-entry-init.h b/arch/mips/include/asm/mach-ip27/kernel-entry-init.h
new file mode 100644
index 000000000..3e54f605a
--- /dev/null
+++ b/arch/mips/include/asm/mach-ip27/kernel-entry-init.h
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ *
+ * Copyright (C) 2000 Silicon Graphics, Inc.
+ * Copyright (C) 2005 Ralf Baechle <ralf@linux-mips.org>
+ */
+#ifndef __ASM_MACH_IP27_KERNEL_ENTRY_H
+#define __ASM_MACH_IP27_KERNEL_ENTRY_H
+
+#include <asm/sn/addrs.h>
+#include <asm/sn/agent.h>
+#include <asm/sn/klkernvars.h>
+
+/*
+ * TLB bits
+ */
+#define PAGE_GLOBAL (1 << 6)
+#define PAGE_VALID (1 << 7)
+#define PAGE_DIRTY (1 << 8)
+#define CACHE_CACHABLE_COW (5 << 9)
+
+ /*
+ * inputs are the text nasid in t1, data nasid in t2.
+ */
+ .macro MAPPED_KERNEL_SETUP_TLB
+#ifdef CONFIG_MAPPED_KERNEL
+ /*
+ * This needs to read the nasid - assume 0 for now.
+ * Drop in 0xffffffffc0000000 in tlbhi, 0+VG in tlblo_0,
+ * 0+DVG in tlblo_1.
+ */
+ dli t0, 0xffffffffc0000000
+ dmtc0 t0, CP0_ENTRYHI
+ li t0, 0x1c000 # Offset of text into node memory
+ dsll t1, NASID_SHFT # Shift text nasid into place
+ dsll t2, NASID_SHFT # Same for data nasid
+ or t1, t1, t0 # Physical load address of kernel text
+ or t2, t2, t0 # Physical load address of kernel data
+ dsrl t1, 12 # 4K pfn
+ dsrl t2, 12 # 4K pfn
+ dsll t1, 6 # Get pfn into place
+ dsll t2, 6 # Get pfn into place
+ li t0, ((PAGE_GLOBAL | PAGE_VALID | CACHE_CACHABLE_COW) >> 6)
+ or t0, t0, t1
+ mtc0 t0, CP0_ENTRYLO0 # physaddr, VG, cach exlwr
+ li t0, ((PAGE_GLOBAL | PAGE_VALID | PAGE_DIRTY | CACHE_CACHABLE_COW) >> 6)
+ or t0, t0, t2
+ mtc0 t0, CP0_ENTRYLO1 # physaddr, DVG, cach exlwr
+ li t0, 0x1ffe000 # MAPPED_KERN_TLBMASK, TLBPGMASK_16M
+ mtc0 t0, CP0_PAGEMASK
+ li t0, 0 # KMAP_INX
+ mtc0 t0, CP0_INDEX
+ li t0, 1
+ mtc0 t0, CP0_WIRED
+ tlbwi
+#else
+ mtc0 zero, CP0_WIRED
+#endif
+ .endm
+
+/*
+ * Intentionally empty macro, used in head.S. Override in
+ * arch/mips/mach-xxx/kernel-entry-init.h when necessary.
+ */
+ .macro kernel_entry_setup
+ GET_NASID_ASM t1
+ move t2, t1 # text and data are here
+ MAPPED_KERNEL_SETUP_TLB
+ .endm
+
+/*
+ * Do SMP slave processor setup necessary before we can safely execute C code.
+ */
+ .macro smp_slave_setup
+ GET_NASID_ASM t1
+ dli t0, KLDIR_OFFSET + (KLI_KERN_VARS * KLDIR_ENT_SIZE) + \
+ KLDIR_OFF_POINTER + CAC_BASE
+ dsll t1, NASID_SHFT
+ or t0, t0, t1
+ ld t0, 0(t0) # t0 points to kern_vars struct
+ lh t1, KV_RO_NASID_OFFSET(t0)
+ lh t2, KV_RW_NASID_OFFSET(t0)
+ MAPPED_KERNEL_SETUP_TLB
+
+ /*
+ * We might not get launched at the address the kernel is linked to,
+ * so we jump there.
+ */
+ PTR_LA t0, 0f
+ jr t0
+0:
+ .endm
+
+#endif /* __ASM_MACH_IP27_KERNEL_ENTRY_H */