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authorKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>2010-08-27 20:19:33 +0200
committerH. Peter Anvin <hpa@zytor.com>2010-08-28 03:14:31 +0200
commit6f44d0337cc54a46e83b4c8a6195607e78fff71d (patch)
treea72545f439eac02ea0a1f519d5ee9bc883f3c094 /arch
parentx86, iommu: Utilize the IOMMU_INIT macros functionality. (diff)
downloadlinux-6f44d0337cc54a46e83b4c8a6195607e78fff71d.tar.xz
linux-6f44d0337cc54a46e83b4c8a6195607e78fff71d.zip
x86, doc: Adding comments about .iommu_table and its neighbors.
Updating the linker section with comments about .iommu_table and some other ones that I know of. CC: Sam Ravnborg <sam@ravnborg.org> CC: H. Peter Anvin <hpa@zytor.com> CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp> CC: Thomas Gleixner <tglx@linutronix.de> CC: Ingo Molnar <mingo@redhat.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> LKML-Reference: <1282933173-19960-1-git-send-email-konrad.wilk@oracle.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/vmlinux.lds.S22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
index b92e040466c1..3f07c370f761 100644
--- a/arch/x86/kernel/vmlinux.lds.S
+++ b/arch/x86/kernel/vmlinux.lds.S
@@ -242,6 +242,12 @@ SECTIONS
__x86_cpu_dev_end = .;
}
+ /*
+ * start address and size of operations which during runtime
+ * can be patched with virtualization friendly instructions or
+ * baremetal native ones. Think page table operations.
+ * Details in paravirt_types.h
+ */
. = ALIGN(8);
.parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
__parainstructions = .;
@@ -249,6 +255,11 @@ SECTIONS
__parainstructions_end = .;
}
+ /*
+ * struct alt_inst entries. From the header (alternative.h):
+ * "Alternative instructions for different CPU types or capabilities"
+ * Think locking instructions on spinlocks.
+ */
. = ALIGN(8);
.altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
__alt_instructions = .;
@@ -256,10 +267,21 @@ SECTIONS
__alt_instructions_end = .;
}
+ /*
+ * And here are the replacement instructions. The linker sticks
+ * them as binary blobs. The .altinstructions has enough data to
+ * get the address and the length of them to patch the kernel safely.
+ */
.altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
*(.altinstr_replacement)
}
+ /*
+ * struct iommu_table_entry entries are injected in this section.
+ * It is an array of IOMMUs which during run time gets sorted depending
+ * on its dependency order. After rootfs_initcall is complete
+ * this section can be safely removed.
+ */
.iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
__iommu_table = .;
*(.iommu_table)