summaryrefslogtreecommitdiffstats
path: root/arch/riscv/mm/init.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/riscv/mm/init.c')
-rw-r--r--arch/riscv/mm/init.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index e3405e4b99..7e25606f85 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -233,8 +233,6 @@ static void __init setup_bootmem(void)
*/
memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
- phys_ram_end = memblock_end_of_DRAM();
-
/*
* Make sure we align the start of the memory on a PMD boundary so that
* at worst, we map the linear mapping with PMD mappings.
@@ -250,6 +248,16 @@ static void __init setup_bootmem(void)
kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base;
/*
+ * The size of the linear page mapping may restrict the amount of
+ * usable RAM.
+ */
+ if (IS_ENABLED(CONFIG_64BIT)) {
+ max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE;
+ memblock_cap_memory_range(phys_ram_base,
+ max_mapped_addr - phys_ram_base);
+ }
+
+ /*
* Reserve physical address space that would be mapped to virtual
* addresses greater than (void *)(-PAGE_SIZE) because:
* - This memory would overlap with ERR_PTR
@@ -265,6 +273,7 @@ static void __init setup_bootmem(void)
memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr);
}
+ phys_ram_end = memblock_end_of_DRAM();
min_low_pfn = PFN_UP(phys_ram_base);
max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
@@ -1289,8 +1298,6 @@ static void __init create_linear_mapping_page_table(void)
if (start <= __pa(PAGE_OFFSET) &&
__pa(PAGE_OFFSET) < end)
start = __pa(PAGE_OFFSET);
- if (end >= __pa(PAGE_OFFSET) + memory_limit)
- end = __pa(PAGE_OFFSET) + memory_limit;
create_linear_mapping_range(start, end, 0);
}