SeaBIOS April 2014

seabios@seabios.org

15 participants
35 discussions

[PATCH v2] Update EFI_COMPATIBILITY16_TABLE to match 0.98 spec update
by David Woodhouse 02 Jun '14

02 Jun '14

We expect to use the space between the top of option ROMs and the bottom of our own BIOS code as a stack. OVMF was previously marking the whole region from 0xC0000 to 0xFFFFF read-only before invoking our Legacy16Boot method. Read-only stack considered harmful. Version 0.98 of the CSM spec adds the UmaAddress and UmaSize fields, which allow the CSM to specify a memory region that needs to be writable. There exists CONFIG_MALLOC_UPPERMEMORY which we could turn off to use the 9-segment, but that isn't particularly useful for the CSM case either because that memory isn't ours to play with until the final Legacy16Boot call. There's a LowPmmMemory given to use by UEFI to play with, but that's right in the *middle* of low memory and using that for persistent allocations would be painful. So just require CONFIG_MALLOC_UPPERMEMORY when building a CSM. Signed-off-by: David Woodhouse <David.Woodhouse(a)intel.com> --- v2: Require CONFIG_MALLOC_UPPERMEMORY. Default UmaAddress to &zonelow_base. src/Kconfig | 2 +- src/fw/csm.c | 6 +++++- src/std/LegacyBios.h | 20 ++++++++++++++++++++ 3 files changed, 26 insertions(+), 2 deletions(-) diff --git a/src/Kconfig b/src/Kconfig index a42ab2d..093075c 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -114,7 +114,7 @@ endchoice the BIOS in 16bit protected mode. config MALLOC_UPPERMEMORY - bool "Allocate memory that needs to be in first Meg above 0xc0000" + bool "Allocate memory that needs to be in first Meg above 0xc0000" if !CSM default y help Use the "Upper Memory Block" area (0xc0000-0xf0000) for diff --git a/src/fw/csm.c b/src/fw/csm.c index dfb0d12..4e4b688 100644 --- a/src/fw/csm.c +++ b/src/fw/csm.c @@ -34,6 +34,8 @@ EFI_COMPATIBILITY16_TABLE csm_compat_table VARFSEG __aligned(16) = { .Compatibility16CallOffset = 0 /* Filled in by checkrom.py */, .OemIdStringPointer = (u32)"SeaBIOS", .AcpiRsdPtrPointer = (u32)&csm_rsdp, + .UmaAddress = (u32)&zonelow_base, + .UmaSize = 0x10000, }; EFI_TO_COMPATIBILITY16_INIT_TABLE *csm_init_table; @@ -46,9 +48,11 @@ extern void __csm_return(struct bregs *regs) __noreturn; static void csm_return(struct bregs *regs) { - dprintf(3, "handle_csm returning AX=%04x\n", regs->ax); + u32 top = rom_get_max(); PICMask = pic_irqmask_read(); + csm_compat_table.UmaAddress = top; + csm_compat_table.UmaSize = 0xf0000 - top; __csm_return(regs); } diff --git a/src/std/LegacyBios.h b/src/std/LegacyBios.h index cf0c3c5..5170c37 100644 --- a/src/std/LegacyBios.h +++ b/src/std/LegacyBios.h @@ -228,6 +228,26 @@ typedef struct { /// Maximum PCI bus number assigned. /// UINT8 LastPciBus; + + /// + /// Start address of UMB RAM + /// + UINT32 UmaAddress; + + /// + /// Size of UMB RAM + /// + UINT32 UmaSize; + + /// + /// Start address of persistent allocation in high (>1MiB) memory + /// + UINT32 HiPermanentMemoryAddress; + + /// + /// Size of persistent allocation in high (>1MiB) memory + /// + UINT32 HiPermanentMemorySize; } EFI_COMPATIBILITY16_TABLE; /// -- 1.8.3.1 -- David Woodhouse Open Source Technology Centre David.Woodhouse(a)intel.com Intel Corporation

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[PATCH 0/3] Run pvscsi driver entirely in 32bit mode.
by Kevin O'Connor 30 May '14

30 May '14

As with the recent change to AHCI, if the pvscsi driver needs to jump into 32bit mode to access a register, then it's better to run the pvscsi driver entirely in 32bit mode. Evgeny, can you take a look at this and give it a test? Also, what command line do you use for testing? I tried testing locally by adding: -device pvscsi,id=pvscsi0 -device scsi-disk,bus=pvscsi0.0,drive=drive0 -drive id=drive0,if=none,file=dos-drivec-new to my qemu command line (both qemu v1.6 and qemu v1.7), but it doesn't work for me even before my changes. It hangs in pvscsi_wait_intr_cmpl(). -Kevin Kevin O'Connor (3): pvscsi: Don't store reference to struct pci_device. pvscsi: Always run entirely in 32bit mode. pvscsi: Remove use of LOWFLAT and GLOBALFLAT macros. Makefile | 4 +-- src/block.c | 8 +++-- src/hw/blockcmd.c | 3 +- src/hw/pvscsi.c | 106 +++++++++++++++++++++++++----------------------------- 4 files changed, 58 insertions(+), 63 deletions(-) -- 1.8.3.1

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[RFC PATCH] Add support for Intel Quark UART.
by David Woodhouse 28 May '14

28 May '14

This provides basic debug output on the Quark system, assuming that *something* (i.e. coreboot or UEFI) has set it up in advance for us. Signed-off-by: David Woodhouse <David.Woodhouse(a)intel.com> --- I looked briefly at making this part of the CONFIG_DEBUG_SERIAL code, and making that generic enough to handle I/O access *or* MMIO access depending on what's present... but in fact that's probably overkill. This isn't really limited to Quark; it would work with any 16550 device wired up as MMIO32. But we can expand it as required, I think. No point in starting off with the same functionality as the 5000-odd lines of the Linux kernel's 8250_pci.c. What do I need to do if called in 32-bit segmented mode? I'm guessing that's not going to work right now... src/Kconfig | 5 +++++ src/fw/csm.c | 2 ++ src/output.c | 64 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) diff --git a/src/Kconfig b/src/Kconfig index a42ab2d..bdc2602 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -472,6 +472,11 @@ menu "Debugging" Set to zero to disable debugging. + config DEBUG_QUARK_UART + depends on DEBUG_LEVEL != 0 + bool "Debug to Quark UART #1" + default n + config DEBUG_SERIAL depends on DEBUG_LEVEL != 0 bool "Serial port debugging" diff --git a/src/fw/csm.c b/src/fw/csm.c index dfb0d12..afd7ffe 100644 --- a/src/fw/csm.c +++ b/src/fw/csm.c @@ -280,6 +280,8 @@ handle_csm(struct bregs *regs) if (!CONFIG_CSM) return; + debug_serial_preinit(); + dprintf(3, "handle_csm regs %p AX=%04x\n", regs, regs->ax); pic_irqmask_write(PICMask); diff --git a/src/output.c b/src/output.c index b47625f..a90d350 100644 --- a/src/output.c +++ b/src/output.c @@ -17,6 +17,8 @@ #include "stacks.h" // call16_int #include "string.h" // memset #include "util.h" // ScreenAndDebug +#include "hw/pci_regs.h" // PCI_VENDOR_ID, PCI_BASE_ADDRESS_0 +#include "hw/pci.h" // pci_config_readl struct putcinfo { void (*func)(struct putcinfo *info, char c); @@ -31,9 +33,59 @@ struct putcinfo { u16 DebugOutputPort VARFSEG = 0x402; +static volatile u32 *quark_uart_addr = 0; + +extern void _cfunc32flat_quark_uart_preinit(void); +extern void _cfunc32flat_quark_uart_putc(void); +extern void _cfunc32flat_quark_uart_flush(void); + +void quark_uart_preinit(void) +{ + // debug port is bus 0, device 0x14, function 5. + u16 uart_bdf = pci_to_bdf(0, 0x14, 5); + + // If it isn't a Quark UART... + if (pci_config_readl(uart_bdf, PCI_VENDOR_ID) != 0x09368086) + return; + + u32 bar0 = pci_config_readl(uart_bdf, PCI_BASE_ADDRESS_0); + if (!(bar0 & 0xf)) + quark_uart_addr = (void *)bar0; +} + +void quark_uart_putc(char c) +{ + if (!quark_uart_addr) + return; + + int timeout = DEBUG_TIMEOUT; + while ((quark_uart_addr[SEROFF_LSR] & 0x20) != 0x20) + if (!timeout--) + // Ran out of time. + return; + quark_uart_addr[SEROFF_DATA] = c; +} + +void quark_uart_flush(void) +{ + if (!quark_uart_addr) + return; + int timeout = DEBUG_TIMEOUT; + while ((quark_uart_addr[SEROFF_LSR] & 0x60) != 0x60) + if (!timeout--) + // Ran out of time. + return; +} + void debug_serial_preinit(void) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_preinit, 0, 0); + else + quark_uart_preinit(); + } if (!CONFIG_DEBUG_SERIAL) return; // setup for serial logging: 8N1 @@ -54,6 +106,12 @@ debug_serial_preinit(void) static void debug_serial(char c) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_putc, c, 0); + else + quark_uart_putc(c); + } if (!CONFIG_DEBUG_SERIAL) return; int timeout = DEBUG_TIMEOUT; @@ -68,6 +126,12 @@ debug_serial(char c) static void debug_serial_flush(void) { + if (CONFIG_DEBUG_QUARK_UART) { + if (MODE16) + call32(_cfunc32flat_quark_uart_flush, 0, 0); + else + quark_uart_flush(); + } if (!CONFIG_DEBUG_SERIAL) return; int timeout = DEBUG_TIMEOUT; -- 1.8.3.1 -- dwmw2

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[PATCH 0/7] vgabios improvements
by Kevin O'Connor 19 May '14

19 May '14

This patch series refactors the vgabios graphics mode framebuffer manipulation code. It then adds in support for manipulating "direct" framebuffers that modern vga modes use. This series (along with the followup patches for coreboot native vga vgabios) is also available at: https://github.com/KevinOConnor/seabios/tree/testing -Kevin Kevin O'Connor (7): vgabios: Add option to control use of standard VGA IO ports. vgabios: Split vgafb_scroll() into separate move and clear functions. vgabios: Rewrite vgafb.c graphics operations to set of 4 standard operators. vgabios: Introduce text_address(). vgabios: Add support for manipulating framebuffers in high memory. Set the color attribute when calling vgabios print character. vgabios: PMM scan was incorrectly depending on a zero %ds segment. src/output.c | 1 + vgasrc/Kconfig | 8 + vgasrc/vgabios.c | 119 ++++++--- vgasrc/vgabios.h | 34 ++- vgasrc/vgafb.c | 762 +++++++++++++++++++++++++++++-------------------------- vgasrc/vgainit.c | 15 +- 6 files changed, 536 insertions(+), 403 deletions(-) -- 1.9.0

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[RFC] SeaBIOS v2.0 and 32bit drivers
by Kevin O'Connor 13 May '14

13 May '14

I've been considering a possible architectural change to SeaBIOS. Currently, SeaBIOS contains a mix of 16bit code and 32bit code. All of the initialization and bootup code is done in regular 32bit mode, but runtime code (the callbacks the OS uses) is generally run in 16bit mode. I have been thinking about possibly changing this so that hardware driver code runs exclusively in 32bit mode. Specifically, this would involve running the disk controller code, the keyboard/mouse controller code, and all hardware interrupt handlers exclusively in 32bit mode. To support this, some BIOS calls would require SeaBIOS to transition from 16bit mode to 32bit mode in order to satisfy the request. This trampolining to 32bit mode at runtime is already done for the AHCI driver, the XHCI driver, and the pvscsi driver - as these devices can not function with only a 16bit driver. Even with this proposed change, SeaBIOS would still continue to have 16bit code, though the remaining 16bit code would be almost exclusively for interface support and it would be noticeably smaller. In initial tests, the final 16bit code size drops from ~35K to ~16K. The main benefit of this change is that it makes it easier to develop and enhance the SeaBIOS hardware driver code, it makes understanding the code simpler, and reduces the overall size of the SeaBIOS binary. The biggest downside to this change would be problems running old DOS era programs that attempt to run the BIOS in vm86 mode. Specifically, the dos emm386 program is known to prevent 32 bit trampolines in SeaBIOS from working. (There's been a bit of experience with AHCI drivers running in 32bit mode (and now XHCI) so we have good confidence that modern OSes wont present a problem.) To continue to support these old DOS era programs I'm proposing we implement an SMI to help trampoline to 32bit mode. This can be done within SeaBIOS for QEMU TCG, but it would require work on kvm, coreboot, and ovmf to support it. (If we go down this path and these projects aren't extended to help trampoline to 32bit mode, then these projects would no longer be able to run these old DOS era programs with SeaBIOS.) For testing purposes, I have put together a series of patches to run the SeaBIOS drivers in 32bit mode and to implement the QEMU TCG SMI helper. The code is in a very rough state, but it demonstrates the idea. It's available at: https://github.com/KevinOConnor/seabios/tree/testing-32bit-drivers Unfortunately, the QEMU TCG SMI doesn't seem to help in vm86 mode, but I believe it is due to the QEMU code not handling CPL changes properly in SMM mode. I still need to confirm this though. In closing, this email is to start discussion on the proposal. This would not impact the next release of SeaBIOS. Comments? -Kevin

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seabios release?
by Gerd Hoffmann 13 May '14

13 May '14

Hi, I think it's time to start planning the next seabios release. First, because a bunch of changes have piled up in master. And second, because of the smbios changes. They are a step forward in making seabios less dependent on qemu internals and I want have that in qemu soonish. So, how about this plan: (1) merge smbios patches in qemu (patchset is close to final now). (2) merge smbios patch in seabios (3) start freeze (4) tag release candidate (early may is realistic for that I think). (5) pull release candidate into qemu for wider testing (6) merge bugfix patches if needed (7) tag final release 2-3 weeks after release candidate (end of may probably). (8) pull final release into qemu. Comments? cheers, Gerd

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[PATCH v2] ld: don't hardcode "-melf_i386"
by Roger Pau Monne 08 May '14

08 May '14

On FreeBSD, the name of the emulation is "-melf_i386_fbsd", so allow SeaBIOS to fetch the emulation to use from the environment variables. This allows SeaBIOS to compile on FreeBSD with gcc. Signed-off-by: Roger Pau Monné <roger.pau(a)citrix.com> Cc: Ian Campbell <ian.campbell(a)citrix.com> --- Changes in v2: - Rebase on top of master --- Makefile | 5 +++-- 1 files changed, 3 insertions(+), 2 deletions(-) diff --git a/Makefile b/Makefile index e567ba1..4338f94 100644 --- a/Makefile +++ b/Makefile @@ -24,6 +24,7 @@ STRIP=$(CROSS_PREFIX)strip PYTHON=python CPP=cpp IASL:=iasl +LD32BIT_FLAG:=-melf_i386 # Source files SRCBOTH=misc.c stacks.c output.c string.c x86.c block.c cdrom.c mouse.c kbd.c \ @@ -154,8 +155,8 @@ $(OUT)romlayout16.lds: $(OUT)ccode32flat.o $(OUT)code32seg.o $(OUT)ccode16.o $(O @echo " Building ld scripts" $(Q)./scripts/buildversion.sh $(OUT)version.c $(Q)$(CC) $(CFLAGS32FLAT) -c $(OUT)version.c -o $(OUT)version.o - $(Q)$(LD) -melf_i386 -r $(OUT)ccode32flat.o $(OUT)version.o -o $(OUT)code32flat.o - $(Q)$(LD) -melf_i386 -r $(OUT)ccode16.o $(OUT)romlayout.o -o $(OUT)code16.o + $(Q)$(LD) $(LD32BIT_FLAG) -r $(OUT)ccode32flat.o $(OUT)version.o -o $(OUT)code32flat.o + $(Q)$(LD) $(LD32BIT_FLAG) -r $(OUT)ccode16.o $(OUT)romlayout.o -o $(OUT)code16.o $(Q)$(OBJDUMP) -thr $(OUT)code32flat.o > $(OUT)code32flat.o.objdump $(Q)$(OBJDUMP) -thr $(OUT)code32seg.o > $(OUT)code32seg.o.objdump $(Q)$(OBJDUMP) -thr $(OUT)code16.o > $(OUT)code16.o.objdump -- 1.7.7.5 (Apple Git-26)

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[SeaBIOS [PATCH V5 0/2] hw/pci: reserve IO and mem for pci-2-pci bridges with no devices attached
by Marcel Apfelbaum 07 May '14

07 May '14

v4 -> v5 - Addressed Michael S. Tsirkin's comments (patch 2/2): - Open-coded pci_config_is_reserved() method. v3 -> v4: - Addressed Kevin O'Connor's comments: - Refactored a for loop in patch 1/2. - Addressed Michael S. Tsirkin's comments (patch 2/2): - Removed not needed method - Test only base registers (dropped limits tests) - Renamed a helper method - Used 0xFF to test if the memory is reserved - Simplified code in pci_bridge_has_region - I did keep the code that restores base's address as I don't want to modify the registers in a 'query' method. (as replied on the mail thread) v2 -> v3: - Addressed Michael S. Tsirkin's comments: - I/O and Prefetchable Memory are optional. Do not allocate ranges if they are not implemented (2/2). - Note that 2/2 patch can be seen as a separate fix. However, it is related to ranges reservation. v1 -> v2: - Thanks Gerd Hoffmann for the review. - Addressed Michael S. Tsirkin's comments: - Limit capabilities query to 256 iterations, to make sure we don't get into an infinite loop with a broken device. If a pci-2-pci bridge supports hot-plug functionality but there are no devices connected to it, reserve IO/mem in order to be able to attach devices later. Do not waste space, use minimum allowed. Marcel Apfelbaum (2): hw/pci: reserve IO and mem for pci-2-pci bridges with no devices attached hw/pci: check if pci2pci bridges implement optional limit registers src/fw/pciinit.c | 12 +++++------- src/hw/pci.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ src/hw/pci.h | 10 ++++++++++ 3 files changed, 60 insertions(+), 7 deletions(-) -- 1.8.3.1

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Re: [SeaBIOS] [PATCH v2] ld: don't hardcode "-melf_i386"
by Ian Campbell 25 Apr '14

25 Apr '14

On Wed, 2014-04-16 at 14:48 +0200, Idwer Vollering wrote: > 2014-04-16 9:14 GMT+02:00 Roger Pau Monne <roger.pau(a)citrix.com>: > > On FreeBSD, the name of the emulation is "-melf_i386_fbsd", so allow > > SeaBIOS to fetch the emulation to use from the environment variables. > > > > This allows SeaBIOS to compile on FreeBSD with gcc. > > > > Signed-off-by: Roger Pau Monné <roger.pau(a)citrix.com> > > Acked-by: Idwer Vollering <vidwer(a)gmail.com> > > With the note that one needs to use ld from ports' binutils, not the shipped ld: Which according to your debug output supports -melf_i386, so why this patch in that case? > > $ /usr/bin/ld -V && /usr/local/bin/ld -V > GNU ld 2.17.50 [FreeBSD] 2007-07-03 > Supported emulations: > elf_x86_64_fbsd > elf_i386_fbsd > GNU ld (GNU Binutils) 2.24 > Supported emulations: > elf_x86_64_fbsd > elf_i386_fbsd > elf_x86_64 > elf_i386 > elf_l1om > elf_l1om_fbsd > elf_k1om > elf_k1om_fbsd > > > > Cc: Ian Campbell <ian.campbell(a)citrix.com> > > --- > > Changes in v2: > > - Rebase on top of master > > --- > > Makefile | 5 +++-- > > 1 files changed, 3 insertions(+), 2 deletions(-) > > > > diff --git a/Makefile b/Makefile > > index e567ba1..4338f94 100644 > > --- a/Makefile > > +++ b/Makefile > > @@ -24,6 +24,7 @@ STRIP=$(CROSS_PREFIX)strip > > PYTHON=python > > CPP=cpp > > IASL:=iasl > > +LD32BIT_FLAG:=-melf_i386 > > > > # Source files > > SRCBOTH=misc.c stacks.c output.c string.c x86.c block.c cdrom.c mouse.c kbd.c \ > > @@ -154,8 +155,8 @@ $(OUT)romlayout16.lds: $(OUT)ccode32flat.o $(OUT)code32seg.o $(OUT)ccode16.o $(O > > @echo " Building ld scripts" > > $(Q)./scripts/buildversion.sh $(OUT)version.c > > $(Q)$(CC) $(CFLAGS32FLAT) -c $(OUT)version.c -o $(OUT)version.o > > - $(Q)$(LD) -melf_i386 -r $(OUT)ccode32flat.o $(OUT)version.o -o $(OUT)code32flat.o > > - $(Q)$(LD) -melf_i386 -r $(OUT)ccode16.o $(OUT)romlayout.o -o $(OUT)code16.o > > + $(Q)$(LD) $(LD32BIT_FLAG) -r $(OUT)ccode32flat.o $(OUT)version.o -o $(OUT)code32flat.o > > + $(Q)$(LD) $(LD32BIT_FLAG) -r $(OUT)ccode16.o $(OUT)romlayout.o -o $(OUT)code16.o > > $(Q)$(OBJDUMP) -thr $(OUT)code32flat.o > $(OUT)code32flat.o.objdump > > $(Q)$(OBJDUMP) -thr $(OUT)code32seg.o > $(OUT)code32seg.o.objdump > > $(Q)$(OBJDUMP) -thr $(OUT)code16.o > $(OUT)code16.o.objdump > > -- > > 1.7.7.5 (Apple Git-26) > > > > > > _______________________________________________ > > SeaBIOS mailing list > > SeaBIOS(a)seabios.org > > http://www.seabios.org/mailman/listinfo/seabios

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Experiences with link time optimization?
by Paul Menzel 25 Apr '14

25 Apr '14

Dear SeaBIOS folks, in #coreboot on <irc.freenode.net> Stefan mentioned that link time optimization (LTO) [1] might yield some speed improvements for coreboot as the resulting firmware image might be smaller and therefore it takes less time to read it from flash. This was confirmed with coreboot and GCC 4.6.0 in 2011 by Scott Duplichan [2][3]. The same is true for the payload. As LTO has been greatly improved in GCC 4.9.0 and is currently all over the news, I wanted to build SeaBIOS with LTO, but noticed that it already uses `-fwhole-program`. Reading GCC’s online documentation [1], it says it should not be used in combination with `-lto`. -fwhole-program Assume that the current compilation unit represents the whole program being compiled. All public functions and variables with the exception of main and those merged by attribute externally_visible become static functions and in effect are optimized more aggressively by interprocedural optimizers. This option should not be used in combination with -flto. Instead relying on a linker plugin should provide safer and more precise information. Using GCC 4.8.2 from Debian Sid/unstable and just removing `-fwhole-program` and adding `-lto` increased the resulting binary size though. As I do not know a lot about compilers and linkers, could some expert please comment, if `-fwhole-program` already optimizes the code the best way possible for GCC and therefore LTO is not going to reduce SeaBIOS’ binary size? Unfortunately I did not yet try GCC 4.9.0, so I have no idea if something improved in that version. And probably my hack was incorrect anyway. Thanks, Paul [1] http://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html (search for `lto`) [2] http://www.coreboot.org/pipermail/coreboot/2011-April/064859.html [3] http://www.coreboot.org/pipermail/coreboot/2011-May/064874.html

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SeaBIOS April 2014