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Subject[PATCH] riscv: Add support for mem=
Date
From: Jan Kiszka <jan.kiszka@siemens.com>

This sets a memory limit provided via mem= on the command line,
analogously to many other architectures.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
---
arch/riscv/mm/init.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)

diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c
index 965a8cf4829c..09948e43741b 100644
--- a/arch/riscv/mm/init.c
+++ b/arch/riscv/mm/init.c
@@ -488,8 +488,26 @@ static inline void setup_vm_final(void)
}
#endif /* CONFIG_MMU */

+static phys_addr_t memory_limit = PHYS_ADDR_MAX;
+
+/*
+ * Limit the memory size that was specified via FDT.
+ */
+static int __init early_mem(char *p)
+{
+ if (!p)
+ return 1;
+
+ memory_limit = memparse(p, &p) & PAGE_MASK;
+ pr_notice("Memory limited to %lldMB\n", memory_limit >> 20);
+
+ return 0;
+}
+early_param("mem", early_mem);
+
void __init paging_init(void)
{
+ memblock_enforce_memory_limit(memory_limit);
setup_vm_final();
memblocks_present();
sparse_init();
--
2.16.4

--
Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux

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