This patch adds helper functions to manage pci area.
Signed-off-by: Isaku Yamahata yamahata@valinux.co.jp
--- Changes v1 -> v2 - add comments --- Makefile | 3 +- src/pci_region.c | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ src/util.h | 28 +++++++++++++++++++ 3 files changed, 107 insertions(+), 1 deletions(-) create mode 100644 src/pci_region.c
diff --git a/Makefile b/Makefile index 9d412f1..1663a5d 100644 --- a/Makefile +++ b/Makefile @@ -19,7 +19,8 @@ SRCBOTH=misc.c pmm.c stacks.c output.c util.c block.c floppy.c ata.c mouse.c \ SRC16=$(SRCBOTH) system.c disk.c font.c SRC32FLAT=$(SRCBOTH) post.c shadow.c memmap.c coreboot.c boot.c \ acpi.c smm.c mptable.c smbios.c pciinit.c optionroms.c mtrr.c \ - lzmadecode.c bootsplash.c jpeg.c usb-hub.c paravirt.c dev-i440fx.c + lzmadecode.c bootsplash.c jpeg.c usb-hub.c paravirt.c dev-i440fx.c \ + pci_region.c SRC32SEG=util.c output.c pci.c pcibios.c apm.c stacks.c
cc-option = $(shell if test -z "`$(1) $(2) -S -o /dev/null -xc \ diff --git a/src/pci_region.c b/src/pci_region.c new file mode 100644 index 0000000..c8656cb --- /dev/null +++ b/src/pci_region.c @@ -0,0 +1,77 @@ +// helper functions to manage pci io/memory/prefetch memory region +// +// Copyright (C) 2009 Isaku Yamahata <yamahata at valinux co jp> +// +// This file may be distributed under the terms of the GNU LGPLv3 license. +// +// + +#include "util.h" + +#define PCI_REGION_DISABLED (-1) + +void pci_region_init(struct pci_region *r, u32 start, u32 end) +{ + r->start = start; + r->end = end; + + r->cur_end = start; +} + +// PCI_REGION_DISABLED represents that the region is in special state. +// its value is chosen such that cur_end can't be PCI_REGION_DISABLED normally. +u32 pci_region_disable(struct pci_region *r) +{ + return r->cur_end = PCI_REGION_DISABLED; +} + +static int pci_region_disabled(const struct pci_region *r) +{ + return r->cur_end == PCI_REGION_DISABLED; +} + +static u32 pci_region_alloc_align(struct pci_region *r, u32 size, u32 align) +{ + if (pci_region_disabled(r)) { + return 0; + } + + u32 s = ALIGN(r->cur_end, align); + if (s > r->end || s < r->cur_end) { + return 0; + } + u32 e = s + size; + if (e > r->end || e < s) { + return 0; + } + r->cur_end = e; + return s; +} + +u32 pci_region_alloc(struct pci_region *r, u32 size) +{ + return pci_region_alloc_align(r, size, size); +} + +u32 pci_region_align(struct pci_region *r, u32 align) +{ + return pci_region_alloc_align(r, 0, align); +} + +void pci_region_revert(struct pci_region *r, u32 addr) +{ + r->cur_end = addr; +} + +u32 pci_region_addr(const struct pci_region *r) +{ + if (pci_region_disabled(r)){ + return r->end; + } + return r->cur_end; +} + +u32 pci_region_size(const struct pci_region *r) +{ + return r->end - r->start; +} diff --git a/src/util.h b/src/util.h index 5cc9f17..17eedd0 100644 --- a/src/util.h +++ b/src/util.h @@ -344,6 +344,34 @@ void qemu_prep_reset(void); void smm_save_and_copy(void); void smm_relocate_and_restore(void);
+// pci_region.c +// region allocator. pci region allocates the requested region +// sequentially with overflow check. +struct pci_region { + // The region is [start, region). + u32 start; + u32 end; + + // The next allocation is start from this. + // i.e. [start, cur_end) is allocated. + // Right after initialization cur_end == start. + u32 cur_end; +}; +// initialize the pci_region of [start, end) +void pci_region_init(struct pci_region *r, u32 start, u32 end); +// allocate the region of size +u32 pci_region_alloc(struct pci_region *r, u32 size); +// make the next allocation aligned to align +u32 pci_region_align(struct pci_region *r, u32 align); +// revert the allocation to addr. +void pci_region_revert(struct pci_region *r, u32 addr); +// make the allocation fail. +u32 pci_region_disable(struct pci_region *r); +// returns the current allocation point. +u32 pci_region_addr(const struct pci_region *r); +// returns the region size. +u32 pci_region_size(const struct pci_region *r); + // pciinit.c extern const u8 pci_irqs[4]; void pci_bios_allocate_regions(u16 bdf, void *arg);