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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v2 2/3] xen/ppc: Implement early serial printk on pseries
On typical Power VMs (e.g. QEMU's -M pseries), a variety of services
including an early serial console are provided by Open Firmware.
Implement the required interfaces to call into Open Firmware and write
to the serial console.
Since Open Firmware runs in 32-bit Big Endian mode and Xen runs in
64-bit Little Endian mode, a thunk is required to save/restore
any potentially-clobbered registers as well as to perform the
required endianness switch. Thankfully, linux already has such
a routine, which was imported into ppc64/of-call.S.
Support for bare metal (PowerNV) will be implemented in a future
patch.
Signed-off-by: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
---
xen/arch/ppc/Kconfig.debug | 5 +
xen/arch/ppc/Makefile | 2 +
xen/arch/ppc/boot-of.c | 100 +++++++++++++++++
xen/arch/ppc/configs/ppc64_defconfig | 1 +
xen/arch/ppc/early_printk.c | 28 +++++
xen/arch/ppc/include/asm/asm-defns.h | 17 +++
xen/arch/ppc/include/asm/boot.h | 23 ++++
xen/arch/ppc/include/asm/byteorder.h | 12 +++
xen/arch/ppc/include/asm/early_printk.h | 15 +++
xen/arch/ppc/include/asm/msr.h | 51 +++++++++
xen/arch/ppc/include/asm/processor.h | 136 ++++++++++++++++++++++++
xen/arch/ppc/include/asm/types.h | 21 ++++
xen/arch/ppc/ppc64/Makefile | 1 +
xen/arch/ppc/ppc64/asm-offsets.c | 55 ++++++++++
xen/arch/ppc/ppc64/of-call.S | 83 +++++++++++++++
xen/arch/ppc/setup.c | 15 +++
16 files changed, 565 insertions(+)
create mode 100644 xen/arch/ppc/boot-of.c
create mode 100644 xen/arch/ppc/early_printk.c
create mode 100644 xen/arch/ppc/include/asm/boot.h
create mode 100644 xen/arch/ppc/include/asm/byteorder.h
create mode 100644 xen/arch/ppc/include/asm/early_printk.h
create mode 100644 xen/arch/ppc/include/asm/msr.h
create mode 100644 xen/arch/ppc/include/asm/processor.h
create mode 100644 xen/arch/ppc/include/asm/types.h
create mode 100644 xen/arch/ppc/ppc64/of-call.S
diff --git a/xen/arch/ppc/Kconfig.debug b/xen/arch/ppc/Kconfig.debug
index e69de29bb2..608c9ff832 100644
--- a/xen/arch/ppc/Kconfig.debug
+++ b/xen/arch/ppc/Kconfig.debug
@@ -0,0 +1,5 @@
+config EARLY_PRINTK
+ bool "Enable early printk"
+ default DEBUG
+ help
+ Enables early printk debug messages
diff --git a/xen/arch/ppc/Makefile b/xen/arch/ppc/Makefile
index fdbcd730d0..ddc6b09513 100644
--- a/xen/arch/ppc/Makefile
+++ b/xen/arch/ppc/Makefile
@@ -1,4 +1,6 @@
obj-$(CONFIG_PPC64) += ppc64/
+obj-y += boot-of.init.o
+obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
obj-y += setup.o
$(TARGET): $(TARGET)-syms
diff --git a/xen/arch/ppc/boot-of.c b/xen/arch/ppc/boot-of.c
new file mode 100644
index 0000000000..6c69ca94ba
--- /dev/null
+++ b/xen/arch/ppc/boot-of.c
@@ -0,0 +1,100 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright IBM Corp. 2005, 2006, 2007
+ * Copyright Raptor Engineering, LLC
+ *
+ * Authors: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
+ * Hollis Blanchard <hollisb@xxxxxxxxxx>
+ * Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
+ */
+
+#include <xen/init.h>
+#include <xen/stdarg.h>
+#include <xen/types.h>
+#include <asm/boot.h>
+#include <asm/byteorder.h>
+#include <asm/early_printk.h>
+
+#define ADDR(x) (uint32_t)(unsigned long)(x)
+
+/* OF entrypoint*/
+static unsigned long __initdata of_vec;
+
+/* OF device handles*/
+static int __initdata bof_chosen;
+static int __initdata of_out;
+
+static int __init of_call(const char *service, uint32_t nargs, uint32_t nrets,
+ int32_t rets[], ...)
+{
+ int rc;
+ va_list args;
+ int i;
+ struct of_service s = { 0 };
+
+ s.ofs_service = cpu_to_be32(ADDR(service));
+ s.ofs_nargs = cpu_to_be32(nargs);
+ s.ofs_nrets = cpu_to_be32(nrets);
+
+ /* copy all the params into the args array */
+ va_start(args, rets);
+
+ for ( i = 0; i < nargs; i++ )
+ s.ofs_args[i] = cpu_to_be32(va_arg(args, uint32_t));
+
+ va_end(args);
+
+ rc = enter_of(&s, of_vec);
+
+ /* copy all return values to the output rets array */
+ for ( i = 0; i < nrets; i++ )
+ rets[i] = be32_to_cpu(s.ofs_args[i + nargs]);
+
+ return rc;
+}
+
+static int __init of_finddevice(const char *devspec)
+{
+ int rets[1] = { OF_FAILURE };
+
+ of_call("finddevice", 1, 1, rets, devspec);
+ return rets[0];
+}
+
+static int __init of_getprop(int ph, const char *name, void *buf, uint32_t
buflen)
+{
+ int rets[1] = { OF_FAILURE };
+
+ of_call("getprop", 4, 1, rets, ph, ADDR(name), buf, buflen);
+ return rets[0];
+}
+
+int __init of_write(int ih, const char *addr, uint32_t len)
+{
+ int rets[1] = { OF_FAILURE };
+
+ of_call("write", 3, 1, rets, ih, addr, len);
+ return rets[0];
+}
+
+static void __init of_putchar(char c)
+{
+ if ( c == '\n' )
+ {
+ char buf = '\r';
+ of_write(of_out, &buf, 1);
+ }
+ of_write(of_out, &c, 1);
+}
+
+void __init boot_of_init(unsigned long vec)
+{
+ of_vec = vec;
+
+ /* Get a handle to the default console */
+ bof_chosen = of_finddevice("/chosen");
+ of_getprop(bof_chosen, "stdout", &of_out, sizeof(of_out));
+ of_out = be32_to_cpu(of_out);
+
+ early_printk_init(of_putchar);
+}
diff --git a/xen/arch/ppc/configs/ppc64_defconfig
b/xen/arch/ppc/configs/ppc64_defconfig
index 8783eb3488..f7cc075e45 100644
--- a/xen/arch/ppc/configs/ppc64_defconfig
+++ b/xen/arch/ppc/configs/ppc64_defconfig
@@ -10,4 +10,5 @@
CONFIG_PPC64=y
CONFIG_DEBUG=y
CONFIG_DEBUG_INFO=y
+CONFIG_EARLY_PRINTK=y
CONFIG_EXPERT=y
diff --git a/xen/arch/ppc/early_printk.c b/xen/arch/ppc/early_printk.c
new file mode 100644
index 0000000000..c5014945ef
--- /dev/null
+++ b/xen/arch/ppc/early_printk.c
@@ -0,0 +1,28 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#include <xen/init.h>
+#include <asm/boot.h>
+
+static void (*putchar_func)(char);
+
+void __init early_printk_init(void (*putchar)(char))
+{
+ putchar_func = putchar;
+}
+
+void __init early_puts(const char *s, size_t nr)
+{
+ if ( !putchar_func )
+ return;
+
+ while ( nr-- > 0 )
+ putchar_func(*s++);
+}
+
+void __init early_printk(const char *s)
+{
+ if ( !putchar_func )
+ return;
+
+ while ( *s )
+ putchar_func(*s++);
+}
diff --git a/xen/arch/ppc/include/asm/asm-defns.h
b/xen/arch/ppc/include/asm/asm-defns.h
index 3db2063a39..e7cdc9c68c 100644
--- a/xen/arch/ppc/include/asm/asm-defns.h
+++ b/xen/arch/ppc/include/asm/asm-defns.h
@@ -33,4 +33,21 @@
.long 0xa6037b7d; /* mtsrr1 r11 */
\
.long 0x2400004c /* rfid */
+
+/* Taken from Linux kernel source (arch/powerpc/boot/crt0.S) */
+.macro OP_REGS op, width, start, end, base, offset
+ .Lreg=\start
+ .rept (\end - \start + 1)
+ \op .Lreg,\offset+\width*.Lreg(\base)
+ .Lreg=.Lreg+1
+ .endr
+.endm
+
+#define SAVE_GPRS(start, end, base) OP_REGS std, 8, start, end, base, 0
+#define REST_GPRS(start, end, base) OP_REGS ld, 8, start, end, base, 0
+#define SAVE_GPR(n, base) SAVE_GPRS(n, n, base)
+#define REST_GPR(n, base) REST_GPRS(n, n, base)
+#define SAVE_NVGPRS(base) SAVE_GPRS(14, 31, base)
+#define REST_NVGPRS(base) REST_GPRS(14, 31, base)
+
#endif /* _ASM_PPC_ASM_DEFNS_H */
diff --git a/xen/arch/ppc/include/asm/boot.h b/xen/arch/ppc/include/asm/boot.h
new file mode 100644
index 0000000000..9b8a7c43c2
--- /dev/null
+++ b/xen/arch/ppc/include/asm/boot.h
@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_PPC_BOOT_H
+#define _ASM_PPC_BOOT_H
+
+#include <xen/types.h>
+
+/* a collection of interfaces used during boot. */
+enum {
+ OF_FAILURE = -1,
+ OF_SUCCESS = 0,
+};
+
+struct of_service {
+ __be32 ofs_service;
+ __be32 ofs_nargs;
+ __be32 ofs_nrets;
+ __be32 ofs_args[10];
+};
+
+int enter_of(struct of_service *args, unsigned long entry);
+void boot_of_init(unsigned long vec);
+
+#endif /* _ASM_PPC_BOOT_H */
diff --git a/xen/arch/ppc/include/asm/byteorder.h
b/xen/arch/ppc/include/asm/byteorder.h
new file mode 100644
index 0000000000..2b5f6b9f63
--- /dev/null
+++ b/xen/arch/ppc/include/asm/byteorder.h
@@ -0,0 +1,12 @@
+#ifndef _ASM_PPC_BYTEORDER_H
+#define _ASM_PPC_BYTEORDER_H
+
+#define __arch__swab16 __builtin_bswap16
+#define __arch__swab32 __builtin_bswap32
+#define __arch__swab64 __builtin_bswap64
+
+#define __BYTEORDER_HAS_U64__
+
+#include <xen/byteorder/little_endian.h>
+
+#endif /* _ASM_PPC_BYTEORDER_H */
diff --git a/xen/arch/ppc/include/asm/early_printk.h
b/xen/arch/ppc/include/asm/early_printk.h
new file mode 100644
index 0000000000..d1d8b416f4
--- /dev/null
+++ b/xen/arch/ppc/include/asm/early_printk.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef _ASM_PPC_EARLY_PRINTK_H
+#define _ASM_PPC_EARLY_PRINTK_H
+
+#include <xen/early_printk.h>
+
+#ifdef CONFIG_EARLY_PRINTK
+void early_printk_init(void (*putchar)(char));
+void early_printk(const char *s);
+#else
+static inline void early_printk_init(void (*putchar)(char)) {}
+static inline void early_printk(const char *s) {}
+#endif
+
+#endif /* _ASM_PPC_EARLY_PRINTK_H */
diff --git a/xen/arch/ppc/include/asm/msr.h b/xen/arch/ppc/include/asm/msr.h
new file mode 100644
index 0000000000..144511e5c3
--- /dev/null
+++ b/xen/arch/ppc/include/asm/msr.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) IBM Corp. 2005
+ * Copyright Raptor Engineering, LLC
+ *
+ * Authors: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
+ * Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
+ */
+
+#ifndef _ASM_PPC_MSR_H
+#define _ASM_PPC_MSR_H
+
+#include <xen/const.h>
+
+/* Flags in MSR: */
+#define MSR_SF _AC(0x8000000000000000, ULL)
+#define MSR_TA _AC(0x4000000000000000, ULL)
+#define MSR_ISF _AC(0x2000000000000000, ULL)
+#define MSR_HV _AC(0x1000000000000000, ULL)
+#define MSR_VMX _AC(0x0000000002000000, ULL)
+#define MSR_MER _AC(0x0000000000200000, ULL)
+#define MSR_POW _AC(0x0000000000040000, ULL)
+#define MSR_ILE _AC(0x0000000000010000, ULL)
+#define MSR_EE _AC(0x0000000000008000, ULL)
+#define MSR_PR _AC(0x0000000000004000, ULL)
+#define MSR_FP _AC(0x0000000000002000, ULL)
+#define MSR_ME _AC(0x0000000000001000, ULL)
+#define MSR_FE0 _AC(0x0000000000000800, ULL)
+#define MSR_SE _AC(0x0000000000000400, ULL)
+#define MSR_BE _AC(0x0000000000000200, ULL)
+#define MSR_FE1 _AC(0x0000000000000100, ULL)
+#define MSR_IP _AC(0x0000000000000040, ULL)
+#define MSR_IR _AC(0x0000000000000020, ULL)
+#define MSR_DR _AC(0x0000000000000010, ULL)
+#define MSR_PMM _AC(0x0000000000000004, ULL)
+#define MSR_RI _AC(0x0000000000000002, ULL)
+#define MSR_LE _AC(0x0000000000000001, ULL)
+
+/* MSR bits set on the systemsim simulator */
+#define MSR_SIM _AC(0x0000000020000000, ULL)
+#define MSR_SYSTEMSIM _AC(0x0000000010000000, ULL)
+
+/* On a trap, srr1's copy of msr defines some bits as follows: */
+#define MSR_TRAP_FE _AC(0x0000000000100000, ULL) /* Floating Point
Exception */
+#define MSR_TRAP_IOP _AC(0x0000000000080000, ULL) /* Illegal Instruction */
+#define MSR_TRAP_PRIV _AC(0x0000000000040000, ULL) /* Privileged Instruction
*/
+#define MSR_TRAP _AC(0x0000000000020000, ULL) /* Trap Instruction */
+#define MSR_TRAP_NEXT _AC(0x0000000000010000, ULL) /* PC is next instruction
*/
+#define MSR_TRAP_BITS (MSR_TRAP_FE|MSR_TRAP_IOP|MSR_TRAP_PRIV|MSR_TRAP)
+
+#endif /* _ASM_PPC_MSR_H */
diff --git a/xen/arch/ppc/include/asm/processor.h
b/xen/arch/ppc/include/asm/processor.h
new file mode 100644
index 0000000000..9fc0981266
--- /dev/null
+++ b/xen/arch/ppc/include/asm/processor.h
@@ -0,0 +1,136 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright IBM Corp. 2005, 2006, 2007
+ * Copyright Raptor Engineering, LLC
+ *
+ * Authors: Hollis Blanchard <hollisb@xxxxxxxxxx>
+ * Christian Ehrhardt <ehrhardt@xxxxxxxxxxxxxxxxxx>
+ * Timothy Pearson <tpearson@xxxxxxxxxxxxxxxxxxxxx>
+ * Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
+ */
+
+#ifndef _ASM_PPC_PROCESSOR_H
+#define _ASM_PPC_PROCESSOR_H
+
+#include <xen/config.h>
+#include <xen/types.h>
+
+#define IOBMP_BYTES 8192
+#define IOBMP_INVALID_OFFSET 0x8000
+
+/* Processor Version Register (PVR) field extraction */
+
+#define PVR_VER(pvr) (((pvr) >> 16) & 0xFFFF) /* Version field */
+#define PVR_REV(pvr) (((pvr) >> 0) & 0xFFFF) /* Revison field */
+
+#define __is_processor(pv) (PVR_VER(mfspr(SPRN_PVR)) == (pv))
+
+/*
+ * IBM has further subdivided the standard PowerPC 16-bit version and
+ * revision subfields of the PVR for the PowerPC 403s into the following:
+ */
+
+#define PVR_FAM(pvr) (((pvr) >> 20) & 0xFFF) /* Family field */
+#define PVR_MEM(pvr) (((pvr) >> 16) & 0xF) /* Member field */
+#define PVR_CORE(pvr) (((pvr) >> 12) & 0xF) /* Core field */
+#define PVR_CFG(pvr) (((pvr) >> 8) & 0xF) /* Configuration field */
+#define PVR_MAJ(pvr) (((pvr) >> 4) & 0xF) /* Major revision field */
+#define PVR_MIN(pvr) (((pvr) >> 0) & 0xF) /* Minor revision field */
+
+/* Processor Version Numbers */
+
+#define PVR_403GA 0x00200000
+#define PVR_403GB 0x00200100
+#define PVR_403GC 0x00200200
+#define PVR_403GCX 0x00201400
+#define PVR_405GP 0x40110000
+#define PVR_STB03XXX 0x40310000
+#define PVR_NP405H 0x41410000
+#define PVR_NP405L 0x41610000
+#define PVR_601 0x00010000
+#define PVR_602 0x00050000
+#define PVR_603 0x00030000
+#define PVR_603e 0x00060000
+#define PVR_603ev 0x00070000
+#define PVR_603r 0x00071000
+#define PVR_604 0x00040000
+#define PVR_604e 0x00090000
+#define PVR_604r 0x000A0000
+#define PVR_620 0x00140000
+#define PVR_740 0x00080000
+#define PVR_750 PVR_740
+#define PVR_740P 0x10080000
+#define PVR_750P PVR_740P
+#define PVR_7400 0x000C0000
+#define PVR_7410 0x800C0000
+#define PVR_7450 0x80000000
+#define PVR_8540 0x80200000
+#define PVR_8560 0x80200000
+/*
+ * For the 8xx processors, all of them report the same PVR family for
+ * the PowerPC core. The various versions of these processors must be
+ * differentiated by the version number in the Communication Processor
+ * Module (CPM).
+ */
+#define PVR_821 0x00500000
+#define PVR_823 PVR_821
+#define PVR_850 PVR_821
+#define PVR_860 PVR_821
+#define PVR_8240 0x00810100
+#define PVR_8245 0x80811014
+#define PVR_8260 PVR_8240
+
+/* 64-bit processors */
+#define PVR_NORTHSTAR 0x0033
+#define PVR_PULSAR 0x0034
+#define PVR_POWER4 0x0035
+#define PVR_ICESTAR 0x0036
+#define PVR_SSTAR 0x0037
+#define PVR_POWER4p 0x0038
+#define PVR_970 0x0039
+#define PVR_POWER5 0x003A
+#define PVR_POWER5p 0x003B
+#define PVR_970FX 0x003C
+#define PVR_POWER6 0x003E
+#define PVR_POWER7 0x003F
+#define PVR_630 0x0040
+#define PVR_630p 0x0041
+#define PVR_970MP 0x0044
+#define PVR_970GX 0x0045
+#define PVR_POWER7p 0x004A
+#define PVR_POWER8E 0x004B
+#define PVR_POWER8NVL 0x004C
+#define PVR_POWER8 0x004D
+#define PVR_POWER9 0x004E
+#define PVR_POWER10 0x0080
+#define PVR_BE 0x0070
+#define PVR_PA6T 0x0090
+
+#ifndef __ASSEMBLY__
+
+#include <xen/types.h>
+
+/* User-accessible registers: nost of these need to be saved/restored
+ * for every nested Xen invocation. */
+struct cpu_user_regs
+{
+ uint64_t gprs[32];
+ uint64_t lr;
+ uint64_t ctr;
+ uint64_t srr0;
+ uint64_t srr1;
+ uint64_t pc;
+ uint64_t msr;
+ uint64_t fpscr;
+ uint64_t xer;
+ uint64_t hid4; /* debug only */
+ uint64_t dar; /* debug only */
+ uint32_t dsisr; /* debug only */
+ uint32_t cr;
+ uint32_t __pad; /* good spot for another 32bit reg */
+ uint32_t entry_vector;
+};
+
+#endif
+
+#endif /* _ASM_PPC_PROCESSOR_H */
diff --git a/xen/arch/ppc/include/asm/types.h b/xen/arch/ppc/include/asm/types.h
new file mode 100644
index 0000000000..cee08e111a
--- /dev/null
+++ b/xen/arch/ppc/include/asm/types.h
@@ -0,0 +1,21 @@
+/* from xen/arch/x86/include/asm/types.h */
+
+#ifndef _ASM_PPC_TYPES_H
+#define _ASM_PPC_TYPES_H
+
+typedef signed char s8;
+typedef unsigned char u8;
+
+typedef signed short s16;
+typedef unsigned short u16;
+
+typedef signed int s32;
+typedef unsigned int u32;
+
+typedef signed long s64;
+typedef unsigned long u64;
+typedef unsigned long paddr_t;
+#define INVALID_PADDR (~0UL)
+#define PRIpaddr "016lx"
+
+#endif /* _ASM_PPC_TYPES_H */
diff --git a/xen/arch/ppc/ppc64/Makefile b/xen/arch/ppc/ppc64/Makefile
index 3340058c08..f4956daaa9 100644
--- a/xen/arch/ppc/ppc64/Makefile
+++ b/xen/arch/ppc/ppc64/Makefile
@@ -1 +1,2 @@
obj-y += head.o
+obj-y += of-call.o
diff --git a/xen/arch/ppc/ppc64/asm-offsets.c b/xen/arch/ppc/ppc64/asm-offsets.c
index e69de29bb2..a6de2b2768 100644
--- a/xen/arch/ppc/ppc64/asm-offsets.c
+++ b/xen/arch/ppc/ppc64/asm-offsets.c
@@ -0,0 +1,55 @@
+/*
+ * Generate definitions needed by assembly language modules.
+ * This code generates raw asm output which is post-processed
+ * to extract and format the required data.
+ */
+
+#include <asm/processor.h>
+
+#define DEFINE(_sym, _val) \
+ asm volatile ("\n.ascii\"==>#define " #_sym " %0 /* " #_val " */<==\"" \
+ : : "i" (_val) )
+#define BLANK() \
+ asm volatile ( "\n.ascii\"==><==\"" : : )
+#define OFFSET(_sym, _str, _mem) \
+ DEFINE(_sym, offsetof(_str, _mem));
+
+/* base-2 logarithm */
+#define __L2(_x) (((_x) & 0x00000002) ? 1 : 0)
+#define __L4(_x) (((_x) & 0x0000000c) ? ( 2 + __L2( (_x)>> 2)) : __L2( _x))
+#define __L8(_x) (((_x) & 0x000000f0) ? ( 4 + __L4( (_x)>> 4)) : __L4( _x))
+#define __L16(_x) (((_x) & 0x0000ff00) ? ( 8 + __L8( (_x)>> 8)) : __L8( _x))
+#define LOG_2(_x) (((_x) & 0xffff0000) ? (16 + __L16((_x)>>16)) : __L16(_x))
+
+void __dummy__(void)
+{
+ DEFINE(GPR_WIDTH, sizeof(unsigned long));
+ DEFINE(FPR_WIDTH, sizeof(double));
+
+ OFFSET(UREGS_gprs, struct cpu_user_regs, gprs);
+ OFFSET(UREGS_r0, struct cpu_user_regs, gprs[0]);
+ OFFSET(UREGS_r1, struct cpu_user_regs, gprs[1]);
+ OFFSET(UREGS_r13, struct cpu_user_regs, gprs[13]);
+ OFFSET(UREGS_srr0, struct cpu_user_regs, srr0);
+ OFFSET(UREGS_srr1, struct cpu_user_regs, srr1);
+ OFFSET(UREGS_pc, struct cpu_user_regs, pc);
+ OFFSET(UREGS_msr, struct cpu_user_regs, msr);
+ OFFSET(UREGS_lr, struct cpu_user_regs, lr);
+ OFFSET(UREGS_ctr, struct cpu_user_regs, ctr);
+ OFFSET(UREGS_xer, struct cpu_user_regs, xer);
+ OFFSET(UREGS_hid4, struct cpu_user_regs, hid4);
+ OFFSET(UREGS_dar, struct cpu_user_regs, dar);
+ OFFSET(UREGS_dsisr, struct cpu_user_regs, dsisr);
+ OFFSET(UREGS_cr, struct cpu_user_regs, cr);
+ OFFSET(UREGS_fpscr, struct cpu_user_regs, fpscr);
+ DEFINE(UREGS_sizeof, sizeof(struct cpu_user_regs));
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/ppc/ppc64/of-call.S b/xen/arch/ppc/ppc64/of-call.S
new file mode 100644
index 0000000000..66065119d5
--- /dev/null
+++ b/xen/arch/ppc/ppc64/of-call.S
@@ -0,0 +1,83 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Adapted from Linux's arch/powerpc/kernel/entry_64.S, with the
+ * following copyright notice:
+ *
+ * PowerPC version
+ * Copyright (C) 1995-1996 Gary Thomas (gdt@xxxxxxxxxxxx)
+ * Rewritten by Cort Dougan (cort@xxxxxxxxxx) for PReP
+ * Copyright (C) 1996 Cort Dougan <cort@xxxxxxxxxx>
+ * Adapted for Power Macintosh by Paul Mackerras.
+ * Low-level exception handlers and MMU support
+ * rewritten by Paul Mackerras.
+ * Copyright (C) 1996 Paul Mackerras.
+ * MPC8xx modifications Copyright (C) 1997 Dan Malek (dmalek@xxxxxxx).
+ */
+
+#include <asm/asm-offsets.h>
+#include <asm/asm-defns.h>
+#include <asm/msr.h>
+
+/* size of minimum stack frame that can hold an entire cpu_user_regs struct */
+#define STACK_SWITCH_FRAME_SIZE (UREGS_sizeof + STACK_FRAME_OVERHEAD)
+
+ .section .init.text, "ax", @progbits
+
+ENTRY(enter_of)
+ mflr %r0
+ std %r0, 16(%r1)
+ stdu %r1,-STACK_SWITCH_FRAME_SIZE(%r1) /* Save SP and create stack space */
+
+ /*
+ * Because PROM is running in 32b mode, it clobbers the high order half
+ * of all registers that it saves. We therefore save those registers
+ * PROM might touch to the stack. (%r0, %r3-%r13 are caller saved)
+ */
+ SAVE_GPR(2, %r1)
+ SAVE_GPR(13, %r1)
+ SAVE_NVGPRS(%r1)
+ mfcr %r10
+ mfmsr %r11
+ std %r10, UREGS_cr(%r1)
+ std %r11, UREGS_msr(%r1)
+
+ /* Put PROM address in SRR0 */
+ mtsrr0 %r4
+
+ /* Setup our trampoline return addr in LR */
+ bcl 20, 31,.+4
+0: mflr %r4
+ addi %r4, %r4,(1f - 0b)
+ mtlr %r4
+
+ /* Prepare a 32-bit mode big endian MSR */
+ LOAD_IMM64(%r12, MSR_SF | MSR_LE)
+ andc %r11, %r11, %r12
+ mtsrr1 %r11
+ rfid
+
+1: /* Return from OF */
+ FIXUP_ENDIAN
+
+ /* Just make sure that %r1 top 32 bits didn't get corrupt by OF */
+ rldicl %r1, %r1, 0, 32
+
+ /* Restore the MSR (back to 64 bits) */
+ ld %r0, UREGS_msr(%r1)
+ mtmsrd %r0
+ isync
+
+ /* Restore other registers */
+ REST_GPR(2, %r1)
+ REST_GPR(13, %r1)
+ REST_NVGPRS(%r1)
+ ld %r4, UREGS_cr(%r1)
+ mtcr %r4
+
+ addi %r1, %r1, STACK_SWITCH_FRAME_SIZE
+ ld %r0, 16(%r1)
+ mtlr %r0
+ blr
+
+ .size enter_of, . - enter_of
+ .type enter_of, %function
diff --git a/xen/arch/ppc/setup.c b/xen/arch/ppc/setup.c
index 4d1b72fa23..1c58164286 100644
--- a/xen/arch/ppc/setup.c
+++ b/xen/arch/ppc/setup.c
@@ -1,10 +1,25 @@
/* SPDX-License-Identifier: GPL-2.0-or-later */
#include <xen/init.h>
+#include <asm/boot.h>
+#include <asm/early_printk.h>
void __init noreturn start_xen(unsigned long r3, unsigned long r4,
unsigned long r5, unsigned long r6,
unsigned long r7)
{
+ if ( r5 )
+ {
+ /* OpenFirmware boot protocol */
+ boot_of_init(r5);
+ }
+ else
+ {
+ /* kexec boot: Unimplemented */
+ __builtin_trap();
+ }
+
+ early_printk("Hello, ppc64le!\n");
+
for ( ;; )
/* Set current hardware thread to very low priority */
asm volatile("or %r31, %r31, %r31");
--
2.30.2
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