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[build] Allow ISA ROMs to be built

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The build process has for a long time assumed that every ROM is a PCI
ROM, and will always include the PCI header and PCI-related
functionality (such as checking the PCI BIOS version, including the
PCI bus:dev.fn address within the ROM product name string, etc.).

While real ISA cards are no longer in use, some virtualisation
environments (notably VirtualBox) have support only for ISA ROMs.
This can cause problems: in particular, VirtualBox will call our
initialisation entry point with random garbage in %ax, which we then
treat as the PCI bus:dev.fn address of the autoboot device: this
generally prevents the default boot sequence from using any network
devices.

Create .isarom and .pcirom prefixes which can be used to explicitly
specify the type of ROM to be created.  (Note that the .mrom prefix
always implies a PCI ROM, since the .mrom mechanism relies on
reconfiguring PCI BARs.)

Make .rom a magic prefix which will automatically select the
appropriate PCI or ISA ROM prefix for ROMs defined via a PCI_ROM() or
ISA_ROM() macro.  To maintain backwards compatibility, we default to
building a PCI ROM for anything which is not directly derived from a
PCI_ROM() or ISA_ROM() macro (e.g. bin/intel.rom).

Add a selection of targets to "make everything" to ensure that the
(relatively obscure) ISA ROM build process is included within the
per-commit QA checks.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2014-08-21 16:34:26 +01:00
parent 5b72cf055c
commit 705907f9a9
8 changed files with 146 additions and 30 deletions
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27
src/arch/i386/prefix/libprefix.S
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@@ -94,6 +94,29 @@ print_character:
ret
.size print_character, . - print_character
/*****************************************************************************
* Utility function: print space
*
* Parameters:
* %ds:di : output buffer (or %di=0 to print to console)
* Returns:
* %ds:di : next character in output buffer (if applicable)
*****************************************************************************
*/
.section ".prefix.lib", "awx", @progbits
.code16
.globl print_space
print_space:
/* Preserve registers */
pushw %ax
/* Print space */
movb $( ' ' ), %al
call print_character
/* Restore registers and return */
popw %ax
ret
.size print_space, . - print_space
/*****************************************************************************
* Utility function: print a NUL-terminated string
*
@@ -231,12 +254,10 @@ print_kill_line:
movb $( '\r' ), %al
call print_character
/* Print 79 spaces */
movb $( ' ' ), %al
movw $79, %cx
1: call print_character
1: call print_space
loop 1b
/* Print CR */
movb $( '\r' ), %al
call print_character
/* Restore registers and return */
popw %cx