Felix Held has submitted this change. ( https://review.coreboot.org/c/coreboot/+/79753?usp=email )
Change subject: cpu/x86/64bit/mode_switch2: The reverse function to mode_switch
......................................................................
cpu/x86/64bit/mode_switch2: The reverse function to mode_switch
Add another mode_switch assembly function to call x86_64 code from
x86_32 code. This is particullary useful for BLOBs like mrc.bin or
FSP that calls back into coreboot.
The user must first wrap all functions that are to be called from
x86_32 using the macro prot2lm_wrapper. Instead of using the original
function the wrapped functions must be passed to the x86_32 BLOBs.
The assembly code assume that 0-3 32bit arguments are passed to
the wrapped function.
Tested:
- Called x86_64 code from x86_32 code in qemu.
- Booted Lenovo X220 using x86_32 MRC using x86_64 console.
Change-Id: Ib625233e5f673eae9f3dcb2d03004c06bb07b149
Signed-off-by: Patrick Rudolph <patrick.rudolph(a)9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/79753
Tested-by: build bot (Jenkins) <no-reply(a)coreboot.org>
Reviewed-by: Arthur Heymans <arthur(a)aheymans.xyz>
---
M src/cpu/x86/64bit/Makefile.inc
A src/cpu/x86/64bit/mode_switch2.S
A src/cpu/x86/64bit/prot2long.inc
3 files changed, 76 insertions(+), 0 deletions(-)
Approvals:
build bot (Jenkins): Verified
Arthur Heymans: Looks good to me, approved
diff --git a/src/cpu/x86/64bit/Makefile.inc b/src/cpu/x86/64bit/Makefile.inc
index e1cf743..24a5a96 100644
--- a/src/cpu/x86/64bit/Makefile.inc
+++ b/src/cpu/x86/64bit/Makefile.inc
@@ -1,6 +1,7 @@
## SPDX-License-Identifier: GPL-2.0-only
all_x86-y += mode_switch.S
+all_x86-y += mode_switch2.S
# Add --defsym=_start=0 to suppress a linker warning.
$(objcbfs)/pt: $(dir)/pt.S $(obj)/config.h
diff --git a/src/cpu/x86/64bit/mode_switch2.S b/src/cpu/x86/64bit/mode_switch2.S
new file mode 100644
index 0000000..65e9d94
--- /dev/null
+++ b/src/cpu/x86/64bit/mode_switch2.S
@@ -0,0 +1,48 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Calls a x86_64 function from x86_32 context.
+ * Must not be directly invoked from C code!
+ */
+
+.text
+.code32
+ .section ".text.long_mode_call_3arg", "ax", @progbits
+ .global long_mode_call_3arg
+long_mode_call_3arg:
+
+ /* Function to call is passed in EAX. */
+
+ /* Backup registers */
+ pushal
+
+ /* Backup stack pointer */
+ mov %esp, %ebp
+
+ /* Enter long mode, preserves ebx */
+ #include <cpu/x86/64bit/entry64.inc>
+
+ /* Align stack */
+ movabs $0xfffffffffffffff0, %rax
+ andq %rax, %rsp
+
+ movl 28(%rbp), %ebx /* Function to call */
+ movl 36(%rbp), %edi /* 1st arg */
+ movl 40(%rbp), %esi /* 2nd arg */
+ movl 44(%rbp), %edx /* 3rd arg */
+
+ call *%rbx
+
+ /* Store return value on stack. popal will fetch it. */
+ mov %eax, 28(%rbp)
+ shr $32, %rax
+ movl %eax, 24(%rbp)
+
+ #include <cpu/x86/64bit/exit32.inc>
+
+ /* Restore stack pointer */
+ mov %ebp, %esp
+
+ /* Restore registers */
+ popal
+
+ ret
diff --git a/src/cpu/x86/64bit/prot2long.inc b/src/cpu/x86/64bit/prot2long.inc
new file mode 100644
index 0000000..96c44a86
--- /dev/null
+++ b/src/cpu/x86/64bit/prot2long.inc
@@ -0,0 +1,27 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+.text
+.code32
+/*
+ * Macro to wrap a x86_64 function to be called from x86_32 code.
+ * This assumes that 0-3 32bit arguments are passed to the
+ * calling function.
+ *
+ * In order to preserve ESP without setting up a stack frame
+ * pass the function to call in EAX. The macro prepends "__prot2lm_"
+ * to the wrapped function name.
+ */
+.macro prot2lm_wrapper func2call:req
+ .global __prot2lm_\func2call
+__prot2lm_\func2call :
+ /* Get function to call */
+ mov $\func2call, %eax
+
+ /*
+ * Jump to function instead of call.
+ * It will return directly to caller.
+ */
+ jmp long_mode_call_3arg
+
+ /* Not reachable */
+.endm
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
File src/device/pciexp_device.c:
https://review.coreboot.org/c/coreboot/+/77338/comment/15a5b81a_eb254710 :
PS11, Line 630: root->max_payload_set = 1;
> That's a good catch, Krystian! This means we couldn't avoid walking the tree […]
Exactly.
Ad.1. This happens right now in patchset 11 AFAIU.
Ad.2. Yes, that's the solution I proposed and intend to incorporate.
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
File src/device/pciexp_device.c:
https://review.coreboot.org/c/coreboot/+/77338/comment/11d90c44_04e59b8f :
PS11, Line 630: root->max_payload_set = 1;
> This would also work, and is much easier than what I suggested. […]
That's a good catch, Krystian! This means we couldn't avoid walking the tree
a second time. TBH, to fix this, I would start from scratch, as all the designs
we had so far tried to avoid exactly this. When walking the tree a second time,
it becomes much simpler, I believe:
1. On the way down, set every device to its own maximum. On the way up, propagate the minimum from the endpoints up to the root port (making sure that we use the minimum of what a bridge was configured and the value from the child, to avoid problems with multiple children and different MPS). i.e. bridge mps = MIN(bridge mps, child mps)
2. Walk a second time, this time we have the minimum configured at the root port and have to propagate that down to all bridges and the endpoints. i.e. simply, child mps = parent mps.
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Change subject: drivers/mipi: Add support for BOE_NV110WUM_L60 panel
......................................................................
Patch Set 8: Code-Review+2
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
Patchset:
PS11:
> So I looked into the spec again and the reasons why we handled this (badly) […]
Thanks for the insights Nico.
Indeed, leveling all the Max Payload Size to 0 (128B) would work too.
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
Patchset:
PS11:
So I looked into the spec again and the reasons why we handled this (badly)
in coreboot in the first place. This seems to be much more of a thing to be
configured by the OS. It was only introduced into coreboot as a workaround
for a broken FSP: https://ticket.coreboot.org/issues/218
So maybe before we go deeper down this rabbit hole, should we test if dis-
abling the code would allow the OS to do its job properly? Or alternatively,
to fix any potential damage done by FSP, simply reset all settings to the
default 128B.
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
File src/device/pciexp_device.c:
https://review.coreboot.org/c/coreboot/+/77338/comment/d2756151_5cb1c09c :
PS11, Line 630: root->max_payload_set = 1;
> So basically, at the end of root port scanning, we need to set the root port's Max Payload Size to a […]
This would also work, and is much easier than what I suggested.
The problem with testing is that this code only limits _max_ payload size. If higher layers only use smaller packages, a potential misconfiguration won't show problems anyway.
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Change subject: device/pciexp_device.c: Fix setting Max Payload Size
......................................................................
Patch Set 11:
(1 comment)
File src/device/pciexp_device.c:
https://review.coreboot.org/c/coreboot/+/77338/comment/8c92ecea_3f49965d :
PS11, Line 630: root->max_payload_set = 1;
> I think this still doesn't catch case where two endpoints have different max payload sizes, for exam […]
So basically, at the end of root port scanning, we need to set the root port's Max Payload Size to all children, and children's children, etc. No need to restart the scan loop. Unfortunately I am not sure we have a configuration like that. Maybe if there is a PCIe WIFI card with Max Payload Size of 128B then yes.
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Change subject: soc/intel/apollolake: Create IBB, IBBL and OBB
......................................................................
Patch Set 26:
(1 comment)
Patchset:
PS25:
> You use it to stitch the image in CB:61922
Ah - the capitals confused me 😊
Yup, FIT and MEU required - gets everything working apart from verified boot as that needs the bootblock to be relocatable
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Attention is currently required from: Andrey Petrov, Angel Pons, Sean Rhodes.
Michał Żygowski has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/65680?usp=email )
Change subject: soc/intel/apollolake: Create IBB, IBBL and OBB
......................................................................
Patch Set 26:
(1 comment)
Patchset:
PS25:
> Manifest Extension Utility?
You use it to stitch the image in CB:61922
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Gerrit-Project: coreboot
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Gerrit-Change-Id: I0deebf04f22f3017ee0c13bf1ca7f6dcc0d458b5
Gerrit-Change-Number: 65680
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