| // 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 first, u32 last) |
| { |
| r->first = first; |
| r->last = last; |
| |
| r->cur_first = r->first; |
| } |
| |
| // PCI_REGION_DISABLED represents that the region is in special state. |
| // its value is chosen such that cur_first can't be PCI_REGION_DISABLED |
| // normally. |
| // NOTE: the area right below 4G is used for LAPIC, so such area can't |
| // be used for PCI memory. |
| u32 pci_region_disable(struct pci_region *r) |
| { |
| return r->cur_first = PCI_REGION_DISABLED; |
| } |
| |
| static int pci_region_disabled(const struct pci_region *r) |
| { |
| return r->cur_first == 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_first, align); |
| if (s > r->last || s < r->cur_first) { |
| return 0; |
| } |
| u32 e = s + size; |
| if (e < s || e - 1 > r->last) { |
| return 0; |
| } |
| r->cur_first = 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_first = addr; |
| } |
| |
| u32 pci_region_addr(const struct pci_region *r) |
| { |
| return r->cur_first; |
| } |
| |
| u32 pci_region_size(const struct pci_region *r) |
| { |
| return r->last - r->first + 1; |
| } |