On Thu, Mar 17, 2016 at 03:15:07PM +0900, Masao Uebayashi wrote:
> This is the intended use, avoid busy-polling of BIOS PC console if
> running on HV. Avoid 100% CPU usage at boot prompt on hypervisors.
>
Which hypervisors have you tested this on?
-ml
> Originally I unconditionally reverted the polling part, which was
> introduced only for Intel Mac Mini. After brief discussion with mikeb@,
> I decided to leave that hack by checking HV bit in CPUID (cpu_ecxfeature).
>
> diff --git a/sys/arch/amd64/stand/libsa/bioscons.c
> b/sys/arch/amd64/stand/libsa/bioscons.c
> index bdff9a4..fa42751 100644
> --- a/sys/arch/amd64/stand/libsa/bioscons.c
> +++ b/sys/arch/amd64/stand/libsa/bioscons.c
> @@ -30,6 +30,7 @@
>
> #include <machine/biosvar.h>
> #include <machine/pio.h>
> +#include <machine/specialreg.h>
>
> #include <dev/cons.h>
> #include <dev/ic/mc146818reg.h>
> @@ -37,7 +38,7 @@
> #include <dev/ic/ns16450reg.h>
> #include <dev/isa/isareg.h>
>
> -#include <lib/libsa/stand.h>
> +#include <libsa.h>
>
> #include "biosdev.h"
>
> @@ -82,14 +83,17 @@ pc_getc(dev_t dev)
> return (rv & 0xff);
> }
>
> - /*
> - * Wait for a character to actually become available. Appears to
> - * be necessary on (at least) the Intel Mac Mini.
> - */
> - do {
> - __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
> - "0" (0x100) : "%ecx", "%edx", "cc" );
> - } while ((rv & 0xff) == 0);
> + if ((cpu_ecxfeature & CPUIDECX_HV) == 0) {
> + /*
> + * Wait for a character to actually become available.
> + * Appears to be necessary on (at least) the Intel Mac
> + * Mini.
> + */
> + do {
> + __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
> + "0" (0x100) : "%ecx", "%edx", "cc" );
> + } while ((rv & 0xff) == 0);
> + }
>
> __asm volatile(DOINT(0x16) : "=a" (rv) : "0" (0x000) :
> "%ecx", "%edx", "cc" );
> diff --git a/sys/arch/i386/stand/libsa/bioscons.c
> b/sys/arch/i386/stand/libsa/bioscons.c
> index 028bef3..b53abcf 100644
> --- a/sys/arch/i386/stand/libsa/bioscons.c
> +++ b/sys/arch/i386/stand/libsa/bioscons.c
> @@ -27,15 +27,20 @@
> */
>
> #include <sys/types.h>
> +
> #include <machine/biosvar.h>
> #include <machine/pio.h>
> +#include <machine/specialreg.h>
> +
> #include <dev/isa/isareg.h>
> #include <dev/ic/mc146818reg.h>
> #include <dev/ic/comreg.h>
> #include <dev/ic/ns16450reg.h>
> /* #include <i386/isa/nvram.h> */
> #include <dev/cons.h>
> -#include <lib/libsa/stand.h>
> +
> +#include <libsa.h>
> +
> #include "debug.h"
> #include "biosdev.h"
>
> @@ -80,14 +85,17 @@ pc_getc(dev_t dev)
> return (rv & 0xff);
> }
>
> - /*
> - * Wait for a character to actually become available. Appears to
> - * be necessary on (at least) the Intel Mac Mini.
> - */
> - do {
> - __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
> - "0" (0x100) : "%ecx", "%edx", "cc" );
> - } while ((rv & 0xff) == 0);
> + if ((cpu_ecxfeature & CPUIDECX_HV) == 0) {
> + /*
> + * Wait for a character to actually become available.
> + * Appears to be necessary on (at least) the Intel Mac
> + * Mini.
> + */
> + do {
> + __asm volatile(DOINT(0x16) "; setnz %b0" : "=a" (rv) :
> + "0" (0x100) : "%ecx", "%edx", "cc" );
> + } while ((rv & 0xff) == 0);
> + }
>
> __asm volatile(DOINT(0x16) : "=a" (rv) : "0" (0x000) :
> "%ecx", "%edx", "cc" );
>
> On Thu, Mar 17, 2016 at 02:58:58PM +0900, Masao Uebayashi wrote:
> > Factor out CPUID code in mdrandom(), invoke it once, then save the
> > result. I'll use it to switch behavior depending on HV or not.
> >
> > efiboot is not tested.
> >
> > Comments?
>
> > >From 104cb04bbbd0f7e40758938cc3103b2370a2285c Mon Sep 17 00:00:00 2001
> > From: Masao Uebayashi <[email protected]>
> > Date: Thu, 10 Mar 2016 21:03:07 +0900
> > Subject: [PATCH 1/3] Factor out CPUID instruction in amd64 boot code
> >
> > ---
> > sys/arch/amd64/stand/boot/Makefile | 1 +
> > sys/arch/amd64/stand/boot/srt0.S | 1 +
> > sys/arch/amd64/stand/cdboot/Makefile | 1 +
> > sys/arch/amd64/stand/cdboot/srt0.S | 2 +
> > sys/arch/amd64/stand/libsa/cpuid.S | 69
> > ++++++++++++++++++++++++++++++++
> > sys/arch/amd64/stand/libsa/libsa.h | 7 ++++
> > sys/arch/amd64/stand/libsa/random_i386.S | 22 +---------
> > sys/arch/amd64/stand/pxeboot/Makefile | 1 +
> > sys/arch/amd64/stand/pxeboot/srt0.S | 2 +
> > 9 files changed, 86 insertions(+), 20 deletions(-)
> > create mode 100644 sys/arch/amd64/stand/libsa/cpuid.S
> >
> > diff --git a/sys/arch/amd64/stand/boot/Makefile
> > b/sys/arch/amd64/stand/boot/Makefile
> > index 359ea31..5811646 100644
> > --- a/sys/arch/amd64/stand/boot/Makefile
> > +++ b/sys/arch/amd64/stand/boot/Makefile
> > @@ -26,6 +26,7 @@ SRCS+= boot.c bootarg.c cmd.c vars.c
> >
> > .PATH: ${SADIR}/libsa
> > SRCS+= gidt.S random_i386.S
> > +SRCS+= cpuid.S
> > SRCS+= cmd_i386.c dev_i386.c exec_i386.c gateA20.c machdep.c
> > SRCS+= bioscons.c biosdev.c diskprobe.c memprobe.c time.c
> > .if ${SOFTRAID:L} == "yes"
> > diff --git a/sys/arch/amd64/stand/boot/srt0.S
> > b/sys/arch/amd64/stand/boot/srt0.S
> > index 9e1ede6..c2a5b2a 100644
> > --- a/sys/arch/amd64/stand/boot/srt0.S
> > +++ b/sys/arch/amd64/stand/boot/srt0.S
> > @@ -87,6 +87,7 @@ _start:
> > rep; stosb
> >
> > call _ASM_LABEL(pmm_init)
> > + call _C_LABEL(initcpuid)
> > call _C_LABEL(boot)
> >
> > jmp _C_LABEL(_rtt)
> > diff --git a/sys/arch/amd64/stand/cdboot/Makefile
> > b/sys/arch/amd64/stand/cdboot/Makefile
> > index 23a261f..04ba1e9 100644
> > --- a/sys/arch/amd64/stand/cdboot/Makefile
> > +++ b/sys/arch/amd64/stand/cdboot/Makefile
> > @@ -19,6 +19,7 @@ BINMODE=644
> > SRCS+= machdep.c dev_i386.c exec_i386.c cmd_i386.c
> > SRCS+= gidt.S random_i386.S biosdev.c bioscons.c gateA20.c \
> > memprobe.c diskprobe.c time.c
> > +SRCS+= cpuid.S
> > SRCS+= softraid.c
> >
> > .PATH: ${S}/stand/boot
> > diff --git a/sys/arch/amd64/stand/cdboot/srt0.S
> > b/sys/arch/amd64/stand/cdboot/srt0.S
> > index 82ff009..abe40d4 100644
> > --- a/sys/arch/amd64/stand/cdboot/srt0.S
> > +++ b/sys/arch/amd64/stand/cdboot/srt0.S
> > @@ -177,6 +177,8 @@ relocated:
> > movl %eax, _C_LABEL(bios_bootdev)
> > movl %eax, _C_LABEL(bios_cddev)
> >
> > + call _C_LABEL(initcpuid)
> > +
> > /*
> > * Now call "main()".
> > *
> > diff --git a/sys/arch/amd64/stand/libsa/cpuid.S
> > b/sys/arch/amd64/stand/libsa/cpuid.S
> > new file mode 100644
> > index 0000000..c3ca1ac
> > --- /dev/null
> > +++ b/sys/arch/amd64/stand/libsa/cpuid.S
> > @@ -0,0 +1,69 @@
> > +/* $OpenBSD$ */
> > +
> > +/*
> > + * Copyright (c) 2016 Masao Uebayashi <[email protected]>
> > + * Copyright (c) 2013 Joel Sing <[email protected]>
> > + *
> > + * Permission to use, copy, modify, and distribute this software for any
> > + * purpose with or without fee is hereby granted, provided that the above
> > + * copyright notice and this permission notice appear in all copies.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> > + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> > + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> > + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> > + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> > + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> > + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> > + */
> > +
> > +#include <machine/param.h>
> > +#include <machine/asm.h>
> > +#include <machine/psl.h>
> > +#include <machine/specialreg.h>
> > +
> > + .data
> > +
> > + .globl _C_LABEL(cpu_id)
> > + .globl _C_LABEL(cpu_feature)
> > + .globl _C_LABEL(cpu_ebxfeature)
> > + .globl _C_LABEL(cpu_ecxfeature)
> > +
> > +_C_LABEL(cpu_id): .long 0
> > +_C_LABEL(cpu_feature): .long 0
> > +_C_LABEL(cpu_ebxfeature): .long 0
> > +_C_LABEL(cpu_ecxfeature): .long 0
> > +
> > + .text
> > +
> > +ENTRY(initcpuid)
> > + pushal
> > +
> > + // See if we have CPU identification.
> > + pushfl
> > + popl %eax
> > + movl %eax, %ecx
> > + orl $PSL_ID, %eax
> > + pushl %eax
> > + popfl
> > + pushfl
> > + popl %eax
> > + pushl %ecx
> > + popfl
> > + andl $PSL_ID, %eax
> > + jz done
> > +
> > + // CPUID leaf = 1, subleaf = 0
> > + movl $1, %eax
> > + movl $0, %ecx
> > + cpuid
> > +
> > + movl %eax, _C_LABEL(cpu_id)
> > + movl %ebx, _C_LABEL(cpu_ebxfeature)
> > + movl %ecx, _C_LABEL(cpu_ecxfeature)
> > + movl %edx, _C_LABEL(cpu_feature)
> > +
> > +done:
> > + popal
> > + ret
> > +END(initcpuid)
> > diff --git a/sys/arch/amd64/stand/libsa/libsa.h
> > b/sys/arch/amd64/stand/libsa/libsa.h
> > index fc65c6f..1934078 100644
> > --- a/sys/arch/amd64/stand/libsa/libsa.h
> > +++ b/sys/arch/amd64/stand/libsa/libsa.h
> > @@ -77,3 +77,10 @@ extern u_int32_t bios_cksumlen;
> > #define MACHINE_CMD cmd_machine /* we have i386-specific commands */
> >
> > #define CHECK_SKIP_CONF check_skip_conf /* we can skip boot.conf with
> > Ctrl */
> > +
> > +/* cpuid.S */
> > +void initcpuid(void);
> > +extern u_int32_t cpu_id;
> > +extern u_int32_t cpu_feature;
> > +extern u_int32_t cpu_ebxfeature;
> > +extern u_int32_t cpu_ecxfeature;
> > diff --git a/sys/arch/amd64/stand/libsa/random_i386.S
> > b/sys/arch/amd64/stand/libsa/random_i386.S
> > index 5e28b40..9d09379 100644
> > --- a/sys/arch/amd64/stand/libsa/random_i386.S
> > +++ b/sys/arch/amd64/stand/libsa/random_i386.S
> > @@ -28,34 +28,16 @@
> > ENTRY(mdrandom)
> > pushal
> >
> > - // See if we have CPU identification.
> > - pushfl
> > - popl %eax
> > - movl %eax, %ecx
> > - orl $PSL_ID, %eax
> > - pushl %eax
> > - popfl
> > - pushfl
> > - popl %eax
> > - pushl %ecx
> > - popfl
> > - andl $PSL_ID, %eax
> > - jz done
> > -
> > - // CPUID leaf = 1, subleaf = 0
> > - movl $1, %eax
> > - movl $0, %ecx
> > - cpuid
> > - movl %edx, %eax
> > -
> > movl 36(%esp), %ebx
> > movl 40(%esp), %edx
> > xorl %edi, %edi
> >
> > + movl _C_LABEL(cpu_ecxfeature), %ecx
> > andl $CPUIDECX_RDRAND, %ecx // See if we have rdrand.
> > jnz userand
> >
> > movl %edx, %ecx
> > + movl _C_LABEL(cpu_feature), %eax
> > andl $CPUID_TSC, %eax // See if we have rdtsc.
> > jnz usetsc
> >
> > diff --git a/sys/arch/amd64/stand/pxeboot/Makefile
> > b/sys/arch/amd64/stand/pxeboot/Makefile
> > index ddf2880..468c7f0 100644
> > --- a/sys/arch/amd64/stand/pxeboot/Makefile
> > +++ b/sys/arch/amd64/stand/pxeboot/Makefile
> > @@ -20,6 +20,7 @@ BINMODE=644
> > SRCS+= machdep.c exec_i386.c cmd_i386.c
> > SRCS+= gidt.S random_i386.S biosdev.c bioscons.c gateA20.c \
> > memprobe.c diskprobe.c time.c ## biosprobe.c
> > +SRCS+= cpuid.S
> > SRCS+= pxe.c pxe_call.S pxe_net.c pxe_udp.c
> > SRCS+= softraid.c
> >
> > diff --git a/sys/arch/amd64/stand/pxeboot/srt0.S
> > b/sys/arch/amd64/stand/pxeboot/srt0.S
> > index 9c9226d..ee79225 100644
> > --- a/sys/arch/amd64/stand/pxeboot/srt0.S
> > +++ b/sys/arch/amd64/stand/pxeboot/srt0.S
> > @@ -172,6 +172,8 @@ relocated:
> > movl $pxe_progname, %eax
> > movl %eax, progname
> >
> > + call _C_LABEL(initcpuid)
> > +
> > /*
> > * Now call "main()".
> > *
> > --
> > 2.7.0
> >
>
> > >From c3072b7c101bd76d9c76b57bd317ce1829ebb153 Mon Sep 17 00:00:00 2001
> > From: Masao Uebayashi <[email protected]>
> > Date: Thu, 17 Mar 2016 14:48:20 +0900
> > Subject: [PATCH 2/3] Implement CPUID in i386 boot loaders too
> >
> > ---
> > sys/arch/i386/stand/boot/Makefile | 1 +
> > sys/arch/i386/stand/boot/srt0.S | 1 +
> > sys/arch/i386/stand/cdboot/Makefile | 1 +
> > sys/arch/i386/stand/cdboot/srt0.S | 2 ++
> > sys/arch/i386/stand/libsa/cpuid.S | 69
> > ++++++++++++++++++++++++++++++++++++
> > sys/arch/i386/stand/libsa/libsa.h | 7 ++++
> > sys/arch/i386/stand/pxeboot/Makefile | 1 +
> > sys/arch/i386/stand/pxeboot/srt0.S | 2 ++
> > 8 files changed, 84 insertions(+)
> > create mode 100644 sys/arch/i386/stand/libsa/cpuid.S
> >
> > diff --git a/sys/arch/i386/stand/boot/Makefile
> > b/sys/arch/i386/stand/boot/Makefile
> > index 4339b82..c01c160 100644
> > --- a/sys/arch/i386/stand/boot/Makefile
> > +++ b/sys/arch/i386/stand/boot/Makefile
> > @@ -29,6 +29,7 @@ SRCS+= boot.c bootarg.c cmd.c vars.c
> > .PATH: ${SADIR}/libsa
> > SRCS+= debug_i386.S
> > SRCS+= gidt.S random_i386.S
> > +SRCS+= cpuid.S
> > SRCS+= apmprobe.c debug.c pciprobe.c ps2probe.c
> > SRCS+= cmd_i386.c dev_i386.c exec_i386.c gateA20.c machdep.c
> > SRCS+= bioscons.c biosdev.c diskprobe.c memprobe.c time.c
> > diff --git a/sys/arch/i386/stand/boot/srt0.S
> > b/sys/arch/i386/stand/boot/srt0.S
> > index 868b326..07f4240 100644
> > --- a/sys/arch/i386/stand/boot/srt0.S
> > +++ b/sys/arch/i386/stand/boot/srt0.S
> > @@ -87,6 +87,7 @@ _start:
> > rep; stosb
> >
> > call _ASM_LABEL(pmm_init)
> > + call _C_LABEL(initcpuid)
> > call _C_LABEL(boot)
> >
> > jmp _C_LABEL(_rtt)
> > diff --git a/sys/arch/i386/stand/cdboot/Makefile
> > b/sys/arch/i386/stand/cdboot/Makefile
> > index 6306887..a533af4 100644
> > --- a/sys/arch/i386/stand/cdboot/Makefile
> > +++ b/sys/arch/i386/stand/cdboot/Makefile
> > @@ -18,6 +18,7 @@ CLEANFILES+= crt0.o ${PROG}.whole
> >
> > .PATH: ${SADIR}/libsa
> > SRCS+= debug_i386.S gidt.S random_i386.S
> > +SRCS+= cpuid.S
> > SRCS+= cmd_i386.c dev_i386.c exec_i386.c gateA20.c machdep.c
> > SRCS+= apmprobe.c bioscons.c biosdev.c debug.c diskprobe.c memprobe.c \
> > pciprobe.c ps2probe.c time.c
> > diff --git a/sys/arch/i386/stand/cdboot/srt0.S
> > b/sys/arch/i386/stand/cdboot/srt0.S
> > index 5a721e2..b9b1a19 100644
> > --- a/sys/arch/i386/stand/cdboot/srt0.S
> > +++ b/sys/arch/i386/stand/cdboot/srt0.S
> > @@ -177,6 +177,8 @@ relocated:
> > movl %eax, _C_LABEL(bios_bootdev)
> > movl %eax, _C_LABEL(bios_cddev)
> >
> > + call _C_LABEL(initcpuid)
> > +
> > /*
> > * Now call "main()".
> > *
> > diff --git a/sys/arch/i386/stand/libsa/cpuid.S
> > b/sys/arch/i386/stand/libsa/cpuid.S
> > new file mode 100644
> > index 0000000..c3ca1ac
> > --- /dev/null
> > +++ b/sys/arch/i386/stand/libsa/cpuid.S
> > @@ -0,0 +1,69 @@
> > +/* $OpenBSD$ */
> > +
> > +/*
> > + * Copyright (c) 2016 Masao Uebayashi <[email protected]>
> > + * Copyright (c) 2013 Joel Sing <[email protected]>
> > + *
> > + * Permission to use, copy, modify, and distribute this software for any
> > + * purpose with or without fee is hereby granted, provided that the above
> > + * copyright notice and this permission notice appear in all copies.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> > + * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> > + * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> > + * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> > + * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> > + * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> > + * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> > + */
> > +
> > +#include <machine/param.h>
> > +#include <machine/asm.h>
> > +#include <machine/psl.h>
> > +#include <machine/specialreg.h>
> > +
> > + .data
> > +
> > + .globl _C_LABEL(cpu_id)
> > + .globl _C_LABEL(cpu_feature)
> > + .globl _C_LABEL(cpu_ebxfeature)
> > + .globl _C_LABEL(cpu_ecxfeature)
> > +
> > +_C_LABEL(cpu_id): .long 0
> > +_C_LABEL(cpu_feature): .long 0
> > +_C_LABEL(cpu_ebxfeature): .long 0
> > +_C_LABEL(cpu_ecxfeature): .long 0
> > +
> > + .text
> > +
> > +ENTRY(initcpuid)
> > + pushal
> > +
> > + // See if we have CPU identification.
> > + pushfl
> > + popl %eax
> > + movl %eax, %ecx
> > + orl $PSL_ID, %eax
> > + pushl %eax
> > + popfl
> > + pushfl
> > + popl %eax
> > + pushl %ecx
> > + popfl
> > + andl $PSL_ID, %eax
> > + jz done
> > +
> > + // CPUID leaf = 1, subleaf = 0
> > + movl $1, %eax
> > + movl $0, %ecx
> > + cpuid
> > +
> > + movl %eax, _C_LABEL(cpu_id)
> > + movl %ebx, _C_LABEL(cpu_ebxfeature)
> > + movl %ecx, _C_LABEL(cpu_ecxfeature)
> > + movl %edx, _C_LABEL(cpu_feature)
> > +
> > +done:
> > + popal
> > + ret
> > +END(initcpuid)
> > diff --git a/sys/arch/i386/stand/libsa/libsa.h
> > b/sys/arch/i386/stand/libsa/libsa.h
> > index 76bf1e0..9539376 100644
> > --- a/sys/arch/i386/stand/libsa/libsa.h
> > +++ b/sys/arch/i386/stand/libsa/libsa.h
> > @@ -81,3 +81,10 @@ extern u_int32_t bios_cksumlen;
> > #define MACHINE_CMD cmd_machine /* we have i386-specific commands */
> >
> > #define CHECK_SKIP_CONF check_skip_conf /* we can skip boot.conf with
> > Ctrl */
> > +
> > +/* cpuid.S */
> > +void initcpuid(void);
> > +extern u_int32_t cpu_id;
> > +extern u_int32_t cpu_feature;
> > +extern u_int32_t cpu_ebxfeature;
> > +extern u_int32_t cpu_ecxfeature;
> > diff --git a/sys/arch/i386/stand/pxeboot/Makefile
> > b/sys/arch/i386/stand/pxeboot/Makefile
> > index 9227246..f26e020 100644
> > --- a/sys/arch/i386/stand/pxeboot/Makefile
> > +++ b/sys/arch/i386/stand/pxeboot/Makefile
> > @@ -21,6 +21,7 @@ SRCS+= debug_i386.S gidt.S random_i386.S
> > SRCS+= cmd_i386.c exec_i386.c gateA20.c machdep.c
> > SRCS+= apmprobe.c bioscons.c biosdev.c debug.c diskprobe.c memprobe.c \
> > pciprobe.c ps2probe.c time.c
> > +SRCS+= cpuid.S
> > SRCS+= pxe_call.S pxe.c pxe_net.c pxe_udp.c
> > SRCS+= softraid.c
> >
> > diff --git a/sys/arch/i386/stand/pxeboot/srt0.S
> > b/sys/arch/i386/stand/pxeboot/srt0.S
> > index 16a0313..a62ee6a 100644
> > --- a/sys/arch/i386/stand/pxeboot/srt0.S
> > +++ b/sys/arch/i386/stand/pxeboot/srt0.S
> > @@ -172,6 +172,8 @@ relocated:
> > movl $pxe_progname, %eax
> > movl %eax, progname
> >
> > + call _C_LABEL(initcpuid)
> > +
> > /*
> > * Now call "main()".
> > *
> > --
> > 2.7.0
> >
>
