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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/x86/kernel/resource.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/x86/kernel/resource.c')
-rw-r--r--arch/x86/kernel/resource.c72
1 files changed, 72 insertions, 0 deletions
diff --git a/arch/x86/kernel/resource.c b/arch/x86/kernel/resource.c
new file mode 100644
index 0000000000..79bc8a97a0
--- /dev/null
+++ b/arch/x86/kernel/resource.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/ioport.h>
+#include <linux/printk.h>
+#include <asm/e820/api.h>
+#include <asm/pci_x86.h>
+
+static void resource_clip(struct resource *res, resource_size_t start,
+ resource_size_t end)
+{
+ resource_size_t low = 0, high = 0;
+
+ if (res->end < start || res->start > end)
+ return; /* no conflict */
+
+ if (res->start < start)
+ low = start - res->start;
+
+ if (res->end > end)
+ high = res->end - end;
+
+ /* Keep the area above or below the conflict, whichever is larger */
+ if (low > high)
+ res->end = start - 1;
+ else
+ res->start = end + 1;
+}
+
+static void remove_e820_regions(struct resource *avail)
+{
+ int i;
+ struct e820_entry *entry;
+ u64 e820_start, e820_end;
+ struct resource orig = *avail;
+
+ if (!pci_use_e820)
+ return;
+
+ for (i = 0; i < e820_table->nr_entries; i++) {
+ entry = &e820_table->entries[i];
+ e820_start = entry->addr;
+ e820_end = entry->addr + entry->size - 1;
+
+ resource_clip(avail, e820_start, e820_end);
+ if (orig.start != avail->start || orig.end != avail->end) {
+ pr_info("resource: avoiding allocation from e820 entry [mem %#010Lx-%#010Lx]\n",
+ e820_start, e820_end);
+ if (avail->end > avail->start)
+ /*
+ * Use %pa instead of %pR because "avail"
+ * is typically IORESOURCE_UNSET, so %pR
+ * shows the size instead of addresses.
+ */
+ pr_info("resource: remaining [mem %pa-%pa] available\n",
+ &avail->start, &avail->end);
+ orig = *avail;
+ }
+ }
+}
+
+void arch_remove_reservations(struct resource *avail)
+{
+ /*
+ * Trim out BIOS area (high 2MB) and E820 regions. We do not remove
+ * the low 1MB unconditionally, as this area is needed for some ISA
+ * cards requiring a memory range, e.g. the i82365 PCMCIA controller.
+ */
+ if (avail->flags & IORESOURCE_MEM) {
+ resource_clip(avail, BIOS_ROM_BASE, BIOS_ROM_END);
+
+ remove_e820_regions(avail);
+ }
+}