From 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 02:46:07 +0000
Subject: [PATCH] add audio
---
kernel/arch/arm/mm/nommu.c | 24 ++++++++++++++++++++----
1 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/kernel/arch/arm/mm/nommu.c b/kernel/arch/arm/mm/nommu.c
index 7d67c70..959f057 100644
--- a/kernel/arch/arm/mm/nommu.c
+++ b/kernel/arch/arm/mm/nommu.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* linux/arch/arm/mm/nommu.c
*
@@ -24,6 +25,13 @@
#include "mm.h"
unsigned long vectors_base;
+
+/*
+ * empty_zero_page is a special page that is used for
+ * zero-initialized data and COW.
+ */
+struct page *empty_zero_page;
+EXPORT_SYMBOL(empty_zero_page);
#ifdef CONFIG_ARM_MPU
struct mpu_rgn_info mpu_rgn_info;
@@ -147,9 +155,21 @@
*/
void __init paging_init(const struct machine_desc *mdesc)
{
+ void *zero_page;
+
early_trap_init((void *)vectors_base);
mpu_setup();
+
+ /* allocate the zero page. */
+ zero_page = memblock_alloc(PAGE_SIZE, PAGE_SIZE);
+ if (!zero_page)
+ panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
+ __func__, PAGE_SIZE, PAGE_SIZE);
+
bootmem_init();
+
+ empty_zero_page = virt_to_page(zero_page);
+ flush_dcache_page(empty_zero_page);
}
/*
@@ -205,15 +225,11 @@
EXPORT_SYMBOL(ioremap);
void __iomem *ioremap_cache(resource_size_t res_cookie, size_t size)
- __alias(ioremap_cached);
-
-void __iomem *ioremap_cached(resource_size_t res_cookie, size_t size)
{
return __arm_ioremap_caller(res_cookie, size, MT_DEVICE_CACHED,
__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_cache);
-EXPORT_SYMBOL(ioremap_cached);
void __iomem *ioremap_wc(resource_size_t res_cookie, size_t size)
{
--
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