SeaBIOS

seabios@seabios.org

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3772 discussions

Re: Floppy setup
by Keith Hui 25 Apr '22

25 Apr '22

(Looping in the SeaBIOS mailing list again.) See this: https://www.seabios.org/Runtime_config It appears CMOS locations are a legacy artifact and files within the cbfs image (eg. etc/floppy0) is the preferred way of passing SeaBIOS settings. If you want a proper fix with the value stored in CMOS (and be configurable via nvramtool), you'll need to modify both SeaBIOS and the coreboot option table layout for your board. If you need help with coreboot and are not subscribed to that mailing list, I can reach out and loop you in. @Kevin - What are we to do for SeaBIOS settings that the we may want to change at runtime eg. via nvramtool? Are there any such settings? Keith On Sun, 24 Apr 2022 at 18:36, Petr Cvek <petrcvekcz(a)gmail.com> wrote: > > Linux actually reads the floppy type from the exact same CMOS location as QEMU compiled SeaBIOS: > > https://elixir.free-electrons.com/linux/v5.12.9/source/arch/x86/include/asm… > > and if I remember correctly I've had to force the type through floppy module parameter, before I modified the coreboot+SeaBIOS source codes. > > The other operating systems will probably try to read the CMOS location as well. IMO it is actually a standard bitfield in IBM PC compatible computer. Also all cmos.layout files start the configuration from bit 384 and some of them even have the first 120 bits explicitly defined as "reserved". > > Under these constraints I think it should be possible to change the line to something like this: > > if (CONFIG_QEMU || CONFIG_USE_CMOS) { > > With CONFIG_USE_CMOS be "n" by default so non floppy boards will end with the old code path. > > Petr > > > Dne 24. 04. 22 v 21:05 Keith Hui napsal(a): > > Hi Petr, > > > > Linux seems to have been able to pick up all the floppy drives on its own. > > > > But if you read a few more lines beyond the snippet you posted, you'll > > see that it only reads nvram for floppy types when compiled for and > > run on QEMU because that layout is hard coded and QEMU-specific. To > > extend it to other coreboot targets that layout will need to be > > incorporated into the option table of all coreboot mainboards, which > > isn't trivial and some boards don't even have floppy ports at all. And > > should those nvram bytes hold value for something else, results can be > > very unpredictable. > > > > You'll also see another way around it, using files etc/floppy0 and > > etc/floppy1 added to the coreboot image. Some tracing within this file > > will tell you what values to use. Downside is changing these values > > also requires reflashing. > > > > Hope this helps. > > > > Keith > > > > On Sun, 24 Apr 2022 at 07:15, Petr Cvek <petrcvekcz(a)gmail.com> wrote: > >> > >> Hello, > >> > >> I was playing with coreboot + floppy and it seems the drive type can be read from CMOS only if the machine is QEMU. > >> > >> payloads/external/SeaBIOS/seabios/src/hw/floppy.c > >> > >> floppy_setup(void) > >> { > >> ... > >> if (CONFIG_QEMU) { > >> u8 type = rtc_read(CMOS_FLOPPY_DRIVE_TYPE); > >> if (type & 0xf0) > >> addFloppy(0, type >> 4); > >> ... > >> } else { > >> u8 type = romfile_loadint("etc/floppy0", 0); > >> ... > >> > >> Is it possible enable this function for a real coreboot target? What way is the most acceptable way to do it (something like || CONFIG_USE_CMOS)? > >> > >> I've forced it with "always true" condition and after adding configurations to cmos table and superio in coreboot, I was able to boot msdos on kontron 986lcd-m board. > >> > >> P.S. original message got stuck somewhere in the mailserver as I forgot to subscribe to seabios mailing list. > >> > >> Regards, > >> Petr > >> _______________________________________________ > >> SeaBIOS mailing list -- seabios(a)seabios.org > >> To unsubscribe send an email to seabios-leave(a)seabios.org

3 2

Floppy setup
by Petr Cvek 24 Apr '22

24 Apr '22

Hello, I was playing with coreboot + floppy and it seems the drive type can be read from CMOS only if the machine is QEMU. payloads/external/SeaBIOS/seabios/src/hw/floppy.c floppy_setup(void) { ... if (CONFIG_QEMU) { u8 type = rtc_read(CMOS_FLOPPY_DRIVE_TYPE); if (type & 0xf0) addFloppy(0, type >> 4); ... } else { u8 type = romfile_loadint("etc/floppy0", 0); ... Is it possible enable this function for a real coreboot target? What way is the most acceptable way to do it (something like || CONFIG_USE_CMOS)? I've forced it with "always true" condition and after adding configurations to cmos table and superio in coreboot, I was able to boot msdos on kontron 986lcd-m board. P.S. original message got stuck somewhere in the mailserver as I forgot to subscribe to seabios mailing list. Regards, Petr

1 0

CDROM/DVD timeouts on real hardware
by Petr Cvek 24 Apr '22

24 Apr '22

Hi, Has anybody tried to boot from CDROM/DVD non-QEMU seabios lately? I've tried to boot a few CDs/DVDs on AHCI and IDE drives and although the drive is detected, it will fail to boot. There is a timeout after which the next drive will boot. It seems the timeout is located somewhere in payloads/external/SeaBIOS/seabios/src/cdrom.c in function cdrom_boot(). When I tried to comment out this test: int ret = scsi_is_ready(&dop); if (ret) dprintf(5, "scsi_is_ready returned %d\n", ret); I was able to boot windows 98SE installation CD, but it failed after a few sectors (probably when the readiness was needed to be tested :D). If somebody can confirm it is not just my board setup (kontron 986lcd-m with the current coreboot branch) I would be grateful. P.S. original message got stuck somewhere in the mailserver as I forgot to subscribe to seabios mailing list. regards, Petr

1 0

[PATCH] memory: reserve more space for ZoneHigh
by Gerd Hoffmann 22 Apr '22

22 Apr '22

Bump BUILD_MAX_HIGHTABLE from 256k to 1M to avoid running out of memory with very large smbios tables. Signed-off-by: Gerd Hoffmann <kraxel(a)redhat.com> --- src/config.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/config.h b/src/config.h index 93c8dbc2d530..f4b19898a1f0 100644 --- a/src/config.h +++ b/src/config.h @@ -17,7 +17,7 @@ // Maximum number of map entries in the e820 map #define BUILD_MAX_E820 32 // Space to reserve in high-memory for tables -#define BUILD_MAX_HIGHTABLE (256*1024) +#define BUILD_MAX_HIGHTABLE (1024*1024) // Largest supported externaly facing drive id #define BUILD_MAX_EXTDRIVE 16 // Number of bytes the smbios may be and still live in the f-segment -- 2.35.1

2 1

[PATCH] MP: fix mptable interrupt source generation for pci devices
by Jay Khandkar 22 Apr '22

22 Apr '22

Set the correct IOAPIC INTIN pin number for pci bus interrupt sources during MP spec table generation (on emulators). Currently, the pin number is set to the interrupt line field in the device's configuration space, which is set to either IRQ 10 or 11 as the boot rom driver expects. This works since qemu maps all ISA compatible PIC IRQs onto IOAPIC pins 0-15, including PIRQs. But it will break if, for some reason, the IRQ is routed to something other than the INTLINE value using, for eg. ACPI _CRS. This patch ensures the pin number is set to the correct value (16-23) that the INTx pin is routed to in APIC mode, in agreement with the ACPI _PRT provided routing. Tested on a Linux 5.17.2 guest on qemu with the pci=nomsi and acpi=noirq boot parameters to force MP table parsing for interrupt sources. Signed-off-by: Jay Khandkar <jaykhandkar2002(a)gmail.com> --- src/fw/mptable.c | 30 ++++++++++++++++++++++++++++-- 1 file changed, 28 insertions(+), 2 deletions(-) diff --git a/src/fw/mptable.c b/src/fw/mptable.c index 47385cc..3a7b02f 100644 --- a/src/fw/mptable.c +++ b/src/fw/mptable.c @@ -18,6 +18,33 @@ #include "util.h" // MaxCountCPUs #include "x86.h" // cpuid +/* table to obtain IOAPIC INTIN pin # for a certain pci slot and pin */ + +/* daisy chaining in line with acpi _PRT */ +#define SLOT_GSIE {0x14, 0x15, 0x16, 0x17} +#define SLOT_GSIF {0x15, 0x16, 0x17, 0x14} +#define SLOT_GSIG {0x16, 0x17, 0x14, 0x15} +#define SLOT_GSIH {0x17, 0x14, 0x15, 0x16} +#define SLOT_GSIA {0x10, 0x11, 0x12, 0x13} + +u8 pirq_intin[32][4] = { SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, SLOT_GSIF, SLOT_GSIG, SLOT_GSIH, + SLOT_GSIE, + + /* INTA -> PIRQA for slot 25 - 31, but 30 + see the default value of D<N>IR */ + SLOT_GSIA, SLOT_GSIA, SLOT_GSIA, SLOT_GSIA, + SLOT_GSIA, + + /* PCIe->PCI bridge. use PIRQ[E-H] */ + SLOT_GSIE, + + SLOT_GSIA }; + void mptable_setup(void) { @@ -114,7 +141,6 @@ mptable_setup(void) if (pci_bdf_to_bus(bdf) != 0) break; int pin = pci_config_readb(bdf, PCI_INTERRUPT_PIN); - int irq = pci_config_readb(bdf, PCI_INTERRUPT_LINE); if (pin == 0) continue; if (dev != pci_bdf_to_busdev(bdf)) { @@ -131,7 +157,7 @@ mptable_setup(void) intsrc->srcbus = pci_bdf_to_bus(bdf); /* PCI bus */ intsrc->srcbusirq = (pci_bdf_to_dev(bdf) << 2) | (pin - 1); intsrc->dstapic = ioapic_id; - intsrc->dstirq = irq; + intsrc->dstirq = pirq_intin[pci_bdf_to_dev(bdf)][pin - 1]; intsrc++; } -- 2.35.2

6 8

[PATCH] qemu: disable builtin acpi and smbios tables by default.
by Gerd Hoffmann 22 Apr '22

22 Apr '22

qemu provides acpi and smbios tables via fw_cfg for many years now. The builtin tables shipped by seabios are only used as fallback for old qemu versions. qemu is about to drop backward compatibility for old versions, machine types for versions 1.4 to 1.7 are deprecated, which turns the fallbacks into dead code. This patch flips the default for the config options controlling the fallback smbios and acpi tables from 'Yes' to 'No'. Eventually the code will be removed altogether at some point in the future. Signed-off-by: Gerd Hoffmann <kraxel(a)redhat.com> --- src/Kconfig | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/Kconfig b/src/Kconfig index 3a8ffa15fded..83ddf45143c3 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -494,25 +494,25 @@ menu "BIOS Tables" Support generation of MPTable. config SMBIOS bool "SMBIOS" - default y + default n help Support generation of SM BIOS tables. This is also sometimes called DMI. config ACPI bool "ACPI" - default y + default n help Support generation of ACPI tables. config ACPI_DSDT bool "Include default ACPI DSDT" - default y + default n depends on ACPI help Include default DSDT ACPI table in BIOS. Required for QEMU 1.3 and older. This option can be disabled for QEMU 1.4 and newer to save some space in the ROM file. - If unsure, say Y. + If unsure, say N. config FW_ROMFILE_LOAD bool "Load BIOS tables from ROM files" depends on QEMU_HARDWARE -- 2.35.1

2 1

[PATCH 0/2] improve ZoneHigh memory management
by Gerd Hoffmann 22 Apr '22

22 Apr '22

When running out of memory get a chunk of memory from ZoneTmpHigh to expand ZoneHigh. Drop simliar logic fro pmm code because it's not needed ay more. This fixes some scalability problems, for example with lots of vcpus, where seabios runs out of memory due to large smbios/acpi tables. Gerd Hoffmann (2): malloc: add on demand ZoneHigh expansion support Revert "pmm: use tmp zone on oom" src/malloc.c | 16 ++++++++++++++++ src/pmm.c | 13 ------------- 2 files changed, 16 insertions(+), 13 deletions(-) -- 2.35.1

3 5

[PATCH] fw/coreboot.c: Use coreboot table to find cbfs
by Arthur Heymans 21 Apr '22

21 Apr '22

The "cbfs master header" cbfs file is considered a legacy feature in coreboot and is planned for removal in the master branch. Since 2015 the coreboot tables have exported info about the active cbfs. This change uses the cbfs information in the coreboot tables instead of following the cbfs master header pointer in the bootblock to find cbfs. This change makes it possible to access CBFS fmap regions that don't feature a "cbfs master header", which is the case with Googles VBOOT solution. This breaks compatibility with very old coreboot build (build before fb5d5b16 "2015-07-14, cbtable: describe boot media"). Keeping backward compatibility with the "cbfs master header" would complicate the code. Signed-off-by: Arthur Heymans <arthur(a)aheymans.xyz> diff --git a/src/Kconfig b/src/Kconfig index 3a8ffa1..51ba827 100644 --- a/src/Kconfig +++ b/src/Kconfig @@ -93,15 +93,6 @@ endchoice help Support CBFS files compressed using the lzma decompression algorithm. - config CBFS_LOCATION - depends on COREBOOT_FLASH - hex "CBFS memory end location" - default 0 - help - Memory address of where the CBFS data ends. This should - be zero for normal builds. It may be a non-zero value if - the CBFS filesystem is at a non-standard location (eg, - 0xffe00000 if CBFS ends 2Meg below the end of flash). config MULTIBOOT depends on COREBOOT diff --git a/src/fw/coreboot.c b/src/fw/coreboot.c index 7c0954b..8a35c1d 100644 --- a/src/fw/coreboot.c +++ b/src/fw/coreboot.c @@ -88,6 +88,18 @@ struct cbmem_console { #define CBMC_OVERFLOW (1 << 31) static struct cbmem_console *cbcon = NULL; +#define CB_TAG_BOOT_MEDIA_PARAMS 0x30 + +struct cb_boot_media_params { + u32 tag; + u32 size; + /* offsets are relative to start of boot media */ + u64 fmap_offset; + u64 cbfs_offset; + u64 cbfs_size; + u64 boot_media_size; +}; + static u16 ipchksum(char *buf, int count) { @@ -146,7 +158,12 @@ find_cb_subtable(struct cb_header *cbh, u32 tag) struct cb_header * find_cb_table(void) { - struct cb_header *cbh = find_cb_header(0, 0x1000); + static struct cb_header *cbh; + + if (cbh) + return cbh; + + cbh= find_cb_header(0, 0x1000); if (!cbh) return NULL; struct cb_forward *cbf = find_cb_subtable(cbh, CB_TAG_FORWARD); @@ -317,20 +334,8 @@ ulzma(u8 *dst, u32 maxlen, const u8 *src, u32 srclen) * Coreboot flash format ****************************************************************/ -#define CBFS_HEADER_MAGIC 0x4F524243 -#define CBFS_VERSION1 0x31313131 - -struct cbfs_header { - u32 magic; - u32 version; - u32 romsize; - u32 bootblocksize; - u32 align; - u32 offset; - u32 pad[2]; -} PACKED; - #define CBFS_FILE_MAGIC 0x455649484352414cLL // LARCHIVE +#define CBFS_ALIGNMENT 64 struct cbfs_file { u64 magic; @@ -429,30 +434,50 @@ coreboot_cbfs_init(void) if (!CONFIG_COREBOOT_FLASH) return; - struct cbfs_header *hdr = *(void **)(CONFIG_CBFS_LOCATION - 4); - if ((u32)hdr & 0x03) { - dprintf(1, "Invalid CBFS pointer %p\n", hdr); + dprintf(3, "Attempting to initialize coreboot cbfs\n"); + + struct cb_header *cbh = find_cb_table(); + if (!cbh) { + dprintf(1, "cbfs_init: unable to find cb table\n"); return; } - if (CONFIG_CBFS_LOCATION && (u32)hdr > CONFIG_CBFS_LOCATION) - // Looks like the pointer is relative to CONFIG_CBFS_LOCATION - hdr = (void*)hdr + CONFIG_CBFS_LOCATION; - if (hdr->magic != cpu_to_be32(CBFS_HEADER_MAGIC)) { - dprintf(1, "Unable to find CBFS (ptr=%p; got %x not %x)\n" - , hdr, hdr->magic, cpu_to_be32(CBFS_HEADER_MAGIC)); + + struct cb_boot_media_params *cbbmp = + find_cb_subtable(cbh, CB_TAG_BOOT_MEDIA_PARAMS); + + if (!cbbmp) { + dprintf(1, "cbfs_init: unable to find boot media params\n"); return; } - dprintf(1, "Found CBFS header at %p\n", hdr); - u32 romsize = be32_to_cpu(hdr->romsize); - u32 romstart = CONFIG_CBFS_LOCATION - romsize; - struct cbfs_file *fhdr = (void*)romstart + be32_to_cpu(hdr->offset); + const u32 romsize = cbbmp->boot_media_size; + const u32 cbfs_start = cbbmp->cbfs_offset - romsize; + const u32 cbfs_end = cbfs_start + cbbmp->cbfs_size - 1; + + dprintf(3, "cbfs_init: cbfs_start=0x%08x, cbfs_end=0x%08x\n", cbfs_start, + cbfs_end); + + u32 offset = cbfs_start; + for (;;) { - if ((u32)fhdr - romstart > romsize) - break; - u64 magic = fhdr->magic; - if (magic != CBFS_FILE_MAGIC) + if (offset > cbfs_end || offset < cbfs_start) break; + + struct cbfs_file *fhdr = (void*)offset; + + if (fhdr->magic != CBFS_FILE_MAGIC) { + offset++; + offset = ALIGN(offset, CBFS_ALIGNMENT); + continue; + } + + /* Skip empty space */ + if (strcmp(fhdr->filename, "") == 0) { + offset += ALIGN(be32_to_cpu(fhdr->offset) + be32_to_cpu(fhdr->len) + , CBFS_ALIGNMENT); + continue; + } + struct cbfs_romfile_s *cfile = malloc_tmp(sizeof(*cfile)); if (!cfile) { warn_noalloc(); @@ -473,8 +498,8 @@ coreboot_cbfs_init(void) } romfile_add(&cfile->file); - fhdr = (void*)ALIGN((u32)cfile->data + cfile->rawsize - , be32_to_cpu(hdr->align)); + offset = ALIGN((u32)cfile->data + cfile->rawsize + , CBFS_ALIGNMENT); } process_links_file(); -- 2.30.2

4 8

CDROM/DVD timeouts on real hardware
by Petr Cvek 21 Apr '22

21 Apr '22

1 0

Floppy setup
by Petr Cvek 21 Apr '22

21 Apr '22

1 0

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