设备枚举后就是资源分配了，在dev_configure函数中完成，代码如下：

void dev_configure(void)
{struct resource *res;struct device *root;struct device *child;set_vga_bridge_bits();printk(BIOS_INFO, "Allocating resources...\n");root = &dev_root; // 根设备/** Each domain should create resources which contain the entire address* space for IO, MEM, and PREFMEM resources in the domain. The* allocation of device resources will be done from this address space.*//* Read the resources for the entire tree. */// 先读一次printk(BIOS_INFO, "Reading resources...\n");read_resources(root->link_list);printk(BIOS_INFO, "Done reading resources.\n");// 打印设备树的资源print_resource_tree(root, BIOS_SPEW, "After reading.");/* Compute resources for all domains. */// 计算资源for (child = root->link_list->children; child; child = child->sibling) {if (!(child->path.type == DEVICE_PATH_DOMAIN))continue;post_log_path(child);for (res = child->resource_list; res; res = res->next) {if (res->flags & IORESOURCE_FIXED)continue;if (res->flags & IORESOURCE_MEM) {compute_resources(child->link_list,res, IORESOURCE_TYPE_MASK, IORESOURCE_MEM);continue;}if (res->flags & IORESOURCE_IO) {compute_resources(child->link_list,res, IORESOURCE_TYPE_MASK, IORESOURCE_IO);continue;}}}/* For all domains. */for (child = root->link_list->children; child; child=child->sibling)if (child->path.type == DEVICE_PATH_DOMAIN)avoid_fixed_resources(child); // 此函数作用? 感觉是对范围的限制/* Store the computed resource allocations into device registers ... */printk(BIOS_INFO, "Setting resources...\n");for (child = root->link_list->children; child; child = child->sibling) {if (!(child->path.type == DEVICE_PATH_DOMAIN))continue;post_log_path(child);// 分mem和io两种资源for (res = child->resource_list; res; res = res->next) {if (res->flags & IORESOURCE_FIXED)continue;if (res->flags & IORESOURCE_MEM) {allocate_resources(child->link_list,res, IORESOURCE_TYPE_MASK, IORESOURCE_MEM);continue;}if (res->flags & IORESOURCE_IO) {allocate_resources(child->link_list,res, IORESOURCE_TYPE_MASK, IORESOURCE_IO);continue;}}}assign_resources(root->link_list);printk(BIOS_INFO, "Done setting resources.\n");print_resource_tree(root, BIOS_SPEW, "After assigning values.");printk(BIOS_INFO, "Done allocating resources.\n");
}

从该函数看出大概有几个步骤：

1、先读一次设备树上的资源，并打印出来。

2、计算资源，compute_resources。

3、对资源范围做限制，avoid_fixed_resources。

4、申请资源，allocate_resources。

5、分配资源，assign_resources。

6、打印分配好的资源(注：此时设备树的资源有部分是第1步骤打印的不同)。

根据代码整理的流程图如下：

(此处留空)

附上此过程的打印信息：

[LL DEBUG]: in bs_dev_resources()...
found VGA at PCI: 00:02.0
Setting up VGA for PCI: 00:02.0
Setting PCI_BRIDGE_CTL_VGA for bridge DOMAIN: 0000
Setting PCI_BRIDGE_CTL_VGA for bridge Root Device
Allocating resources...
Reading resources...
Root Device read_resources bus 0 link: 0
CPU_CLUSTER: 0 read_resources bus 0 link: 0
CPU_CLUSTER: 0 read_resources bus 0 link: 0 done
QEMU: 8 files in fw_cfg
QEMU:     etc/boot-fail-wait [size=4]
QEMU:     etc/e820 [size=20]
QEMU:     genroms/kvmvapic.bin [size=9216]
QEMU:     etc/system-states [size=6]
QEMU:     bootorder [size=0]
QEMU:     etc/acpi/tables [size=8192]
QEMU:     etc/table-loader [size=4096]
QEMU:     etc/acpi/rsdp [size=36]
QEMU: e820/ram: 0x00000000 +0x08000000
QEMU: reserve ioports 0x0510-0x0511 [firmware-config]
QEMU: reserve ioports 0x5658-0x5658 [vmware-port]
QEMU: reserve ioports 0xae00-0xae0f [pci-hotplug]
QEMU: reserve ioports 0xaf00-0xaf1f [cpu-hotplug]
QEMU: reserve ioports 0xafe0-0xafe3 [piix4-gpe0]
DOMAIN: 0000 read_resources bus 0 link: 0
DOMAIN: 0000 read_resources bus 0 link: 0 done
Root Device read_resources bus 0 link: 0 done
Done reading resources.
Show resources in subtree (Root Device)...After reading.Root Device child on link 0 CPU_CLUSTER: 0CPU_CLUSTER: 0 child on link 0 APIC: 00APIC: 00DOMAIN: 0000 child on link 0 PCI: 00:00.0DOMAIN: 0000 resource base 0 size 0 align 0 gran 0 limit ffff flags 40040100 index 10000000DOMAIN: 0000 resource base 0 size 0 align 0 gran 0 limit ffffffff flags 40040200 index 10000100DOMAIN: 0000 resource base 0 size a0000 align 0 gran 0 limit 0 flags e0004200 index aDOMAIN: 0000 resource base c0000 size 7f40000 align 0 gran 0 limit 0 flags e0004200 index bDOMAIN: 0000 resource base 510 size 2 align 0 gran 0 limit ffff flags e0000100 index cDOMAIN: 0000 resource base 5658 size 1 align 0 gran 0 limit ffff flags e0000100 index dDOMAIN: 0000 resource base ae00 size 10 align 0 gran 0 limit ffff flags e0000100 index eDOMAIN: 0000 resource base af00 size 20 align 0 gran 0 limit ffff flags e0000100 index fDOMAIN: 0000 resource base afe0 size 4 align 0 gran 0 limit ffff flags e0000100 index 10DOMAIN: 0000 resource base fec00000 size 100000 align 0 gran 0 limit ffffffff flags e0000200 index 2DOMAIN: 0000 resource base fee00000 size 10000 align 0 gran 0 limit ffffffff flags e0000200 index 3PCI: 00:00.0PCI: 00:01.0PCI: 00:01.0 resource base 0 size 1000 align 0 gran 0 limit ffff flags c0000100 index 1PCI: 00:01.0 resource base ff800000 size 800000 align 0 gran 0 limit 0 flags d0000200 index 2PCI: 00:01.1PCI: 00:01.1 resource base 0 size 10 align 4 gran 4 limit ffff flags 100 index 20PCI: 00:01.3PCI: 00:01.3 resource base e400 size 40 align 0 gran 0 limit ffff flags d0000100 index 1PCI: 00:01.3 resource base f00 size 10 align 0 gran 0 limit ffff flags d0000100 index 2PCI: 00:02.0PCI: 00:02.0 resource base 0 size 2000000 align 25 gran 25 limit ffffffff flags 1200 index 10PCI: 00:02.0 resource base 0 size 1000 align 12 gran 12 limit ffffffff flags 200 index 14PCI: 00:02.0 resource base 0 size 10000 align 16 gran 16 limit ffffffff flags 2200 index 30PCI: 00:03.0PCI: 00:03.0 resource base 0 size 20000 align 17 gran 17 limit ffffffff flags 200 index 10PCI: 00:03.0 resource base 0 size 40 align 6 gran 6 limit ffff flags 100 index 14PCI: 00:03.0 resource base 0 size 40000 align 18 gran 18 limit ffffffff flags 2200 index 30
DOMAIN: 0000 io: base: 0 size: 0 align: 0 gran: 0 limit: ffff
PCI: 00:03.0 14 *  [0x0 - 0x3f] io
PCI: 00:01.1 20 *  [0x40 - 0x4f] io
DOMAIN: 0000 io: base: 50 size: 50 align: 6 gran: 0 limit: ffff done
DOMAIN: 0000 mem: base: 0 size: 0 align: 0 gran: 0 limit: ffffffff
PCI: 00:02.0 10 *  [0x0 - 0x1ffffff] prefmem
PCI: 00:03.0 30 *  [0x2000000 - 0x203ffff] mem
PCI: 00:03.0 10 *  [0x2040000 - 0x205ffff] mem
PCI: 00:02.0 30 *  [0x2060000 - 0x206ffff] mem
PCI: 00:02.0 14 *  [0x2070000 - 0x2070fff] mem
DOMAIN: 0000 mem: base: 2071000 size: 2071000 align: 25 gran: 0 limit: ffffffff done
avoid_fixed_resources: DOMAIN: 0000
avoid_fixed_resources:@DOMAIN: 0000 10000000 limit 0000ffff
avoid_fixed_resources:@DOMAIN: 0000 10000100 limit ffffffff
constrain_resources: DOMAIN: 0000 0a base 00000000 limit 0009ffff mem (fixed)
constrain_resources: DOMAIN: 0000 0b base 000c0000 limit 07ffffff mem (fixed)
constrain_resources: DOMAIN: 0000 0c base 00000510 limit 00000511 io (fixed)
constrain_resources: DOMAIN: 0000 0d base 00005658 limit 00005658 io (fixed)
constrain_resources: DOMAIN: 0000 0e base 0000ae00 limit 0000ae0f io (fixed)
constrain_resources: DOMAIN: 0000 02 base fec00000 limit fecfffff mem (fixed)
avoid_fixed_resources:@DOMAIN: 0000 10000000 base 00005659 limit 0000adff
avoid_fixed_resources:@DOMAIN: 0000 10000100 base fc000000 limit febfffff
Setting resources...
DOMAIN: 0000 io: base:5659 size:50 align:6 gran:0 limit:adff
PCI: 00:03.0 14 *  [0x5800 - 0x583f] io
PCI: 00:01.1 20 *  [0x5840 - 0x584f] io
DOMAIN: 0000 io: next_base: 5850 size: 50 align: 6 gran: 0 done
DOMAIN: 0000 mem: base:fc000000 size:2071000 align:25 gran:0 limit:febfffff
PCI: 00:02.0 10 *  [0xfc000000 - 0xfdffffff] prefmem
PCI: 00:03.0 30 *  [0xfe000000 - 0xfe03ffff] mem
PCI: 00:03.0 10 *  [0xfe040000 - 0xfe05ffff] mem
PCI: 00:02.0 30 *  [0xfe060000 - 0xfe06ffff] mem
PCI: 00:02.0 14 *  [0xfe070000 - 0xfe070fff] mem
DOMAIN: 0000 mem: next_base: fe071000 size: 2071000 align: 25 gran: 0 done
Root Device assign_resources, bus 0 link: 0
DOMAIN: 0000 assign_resources, bus 0 link: 0
PCI: 00:01.1 20 <- [0x0000005840 - 0x000000584f] size 0x00000010 gran 0x04 io
PCI: 00:02.0 10 <- [0x00fc000000 - 0x00fdffffff] size 0x02000000 gran 0x19 prefmem
PCI: 00:02.0 14 <- [0x00fe070000 - 0x00fe070fff] size 0x00001000 gran 0x0c mem
PCI: 00:02.0 30 <- [0x00fe060000 - 0x00fe06ffff] size 0x00010000 gran 0x10 romem
PCI: 00:03.0 10 <- [0x00fe040000 - 0x00fe05ffff] size 0x00020000 gran 0x11 mem
PCI: 00:03.0 14 <- [0x0000005800 - 0x000000583f] size 0x00000040 gran 0x06 io
PCI: 00:03.0 30 <- [0x00fe000000 - 0x00fe03ffff] size 0x00040000 gran 0x12 romem
DOMAIN: 0000 assign_resources, bus 0 link: 0
Root Device assign_resources, bus 0 link: 0
Done setting resources.
Show resources in subtree (Root Device)...After assigning values.Root Device child on link 0 CPU_CLUSTER: 0CPU_CLUSTER: 0 child on link 0 APIC: 00APIC: 00DOMAIN: 0000 child on link 0 PCI: 00:00.0DOMAIN: 0000 resource base 5659 size 50 align 6 gran 0 limit adff flags 40040100 index 10000000DOMAIN: 0000 resource base fc000000 size 2071000 align 25 gran 0 limit febfffff flags 40040200 index 10000100DOMAIN: 0000 resource base 0 size a0000 align 0 gran 0 limit 0 flags e0004200 index aDOMAIN: 0000 resource base c0000 size 7f40000 align 0 gran 0 limit 0 flags e0004200 index bDOMAIN: 0000 resource base 510 size 2 align 0 gran 0 limit ffff flags e0000100 index cDOMAIN: 0000 resource base 5658 size 1 align 0 gran 0 limit ffff flags e0000100 index dDOMAIN: 0000 resource base ae00 size 10 align 0 gran 0 limit ffff flags e0000100 index eDOMAIN: 0000 resource base af00 size 20 align 0 gran 0 limit ffff flags e0000100 index fDOMAIN: 0000 resource base afe0 size 4 align 0 gran 0 limit ffff flags e0000100 index 10DOMAIN: 0000 resource base fec00000 size 100000 align 0 gran 0 limit ffffffff flags e0000200 index 2DOMAIN: 0000 resource base fee00000 size 10000 align 0 gran 0 limit ffffffff flags e0000200 index 3PCI: 00:00.0PCI: 00:01.0PCI: 00:01.0 resource base 0 size 1000 align 0 gran 0 limit ffff flags c0000100 index 1PCI: 00:01.0 resource base ff800000 size 800000 align 0 gran 0 limit 0 flags d0000200 index 2PCI: 00:01.1PCI: 00:01.1 resource base 5840 size 10 align 4 gran 4 limit 584f flags 60000100 index 20PCI: 00:01.3PCI: 00:01.3 resource base e400 size 40 align 0 gran 0 limit ffff flags d0000100 index 1PCI: 00:01.3 resource base f00 size 10 align 0 gran 0 limit ffff flags d0000100 index 2PCI: 00:02.0PCI: 00:02.0 resource base fc000000 size 2000000 align 25 gran 25 limit fdffffff flags 60001200 index 10PCI: 00:02.0 resource base fe070000 size 1000 align 12 gran 12 limit fe070fff flags 60000200 index 14PCI: 00:02.0 resource base fe060000 size 10000 align 16 gran 16 limit fe06ffff flags 60002200 index 30PCI: 00:03.0PCI: 00:03.0 resource base fe040000 size 20000 align 17 gran 17 limit fe05ffff flags 60000200 index 10PCI: 00:03.0 resource base 5800 size 40 align 6 gran 6 limit 583f flags 60000100 index 14PCI: 00:03.0 resource base fe000000 size 40000 align 18 gran 18 limit fe03ffff flags 60002200 index 30
Done allocating resources.

注：
由于coreboot方面资料较少，笔者第一次尝试分析代码，还有众多未能参透的地方，难免出错。任何问题，欢迎一起交流学习。

李迟 2016.4.4 周一 清明节

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