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Sat, 15 Feb 2020 12:50:17 +0100 From: Jan Kiszka To: Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-riscv@lists.infradead.org Subject: [PATCH v2 1/3] riscv: Add support for mem= Date: Sat, 15 Feb 2020 12:49:42 +0100 Message-Id: <617f75f4eaacb02cd9d0a7044434e3e9b65e9e8b.1581767384.git.jan.kiszka@web.de> X-Mailer: git-send-email 2.16.4 In-Reply-To: References: In-Reply-To: References: X-Provags-ID: V03:K1:3S/9It4FAsUZJCi6+Sy0g2D79OQG9MLyYgTZXZ9nUs5XLvx8DzI ooiWxCBCyVHmKstdJ9+eF0vioL+swsjnJQC2ZkeDJH06wucpqRWKY5owhO9Sz011BORVWyU Qq/laO/AwQkpRZqG070Mv9K2jn8T/tpzSYS9/q4pahovz+4jc3YvYZt8iIItjJvjLHqevLL GAWME8nx5vQb4wVt88QTg== X-UI-Out-Filterresults: notjunk:1;V03:K0:12f8oFkUa0Q=:U0+Tvh3IFJCRgaBZDWRtWc YWQqUeJRKaQgWAgA6P0tBgn2xXN6Oug0mnDeNrG+2rgCszMpyP7SUeikQvfc5xSGgQkqwG+zf /d6m5wBjZyHHH92HTsqskjuZdaaU7nDBw+dues+B49jKfMMsThbL5/wNx7Gl06bClx8Kb9lsT r13VP6IHoTUxpfCnOiehsYCWeGTH4XIcrVmPOHqPQp1Tm1DyOUtD/IYtabmDb9+6kYPeRz1PR TvRRLO0olr5R+ezEBzDe+6NomPx/5TGnR9sRh1NNP1DcqV1Dqwp6rRAa3QeeUboo3wH3g2tDj kwBfE7+O1WwbhZK16vPlF4iH0BKEVoOCcvXIUookUOjYiXO2Jk1oUiZP6Amj42PdQuSvvi1so YonZUDeth4oagB1DIZ5ueYSiiSSISBXg/zR9qZj1AVVsnv51E6tJvZgMuscmBBDEcgIeKuH9n nQeC3y0zykmGkl0U3G6CsOb23TztQZjxyN6eZAHVrhuSKA1jWB4pTkJ4FkFX0A0qCS235IrNi toYuwVsdea8B05vhZEXPdhaP7xiTQvew73kaF7wwl28Xj9OaeHK1PbfALA8RY/9aps+Y453hH +u1SjRDY0JKqxZEu3dWmTfDnUmhSzUKEQ7bfZYZsLNDpgUsMubZ+JAnz4KKJ8x6AfLCqjb1Xy 2q8xIiK4ZaXvgu17M5CPpKogo9fVJwQoK/FA3KD1vxNryovgHfkCFbOuQ55k6l3kv/q6lH/Xc K77AODMf7HL5R3W58Mv+MPjqhi6pzOnfAkr8ApR5e7D0Jc1zvDSwuIiwM/8S5/yNsDGkFYD5O QY8q/jHxZpTklIBhFE3E9NfP0vs1ULsvVMWIo/QgvN3KeJohTbpcfIjOgPT6hRX3Gxw/PZLEf ttt+gnoCJ339khOAQ2m+967fqoX+6Jrxp+T2T9/mKKvUQIdHwpbW7AQJ/8gOZ/f7u410nzpkA CMNjAdaXCNLzpNZAvEpJRDMEHxdZbGfSlZmYvFwaJoh1h/e3HT2w9SdmvUaxqdmQEemBwl7vU rtIGUxaziK4XZkijZwvz9JExvdVVKphBJcGZkWBXB3yOZw8bfrLldUUYgCnaW7G4le0UH8TbK 07a/ViLG75ih+ibNBA1dBQigtgHEEEmXwbg9Z/kvKp4LWmPG5C4ubmyctNdVxueYoMAWyY2Gi oALHjbBuIjZQ+Qor8AbDQDJdy4gOXrU1D6F9sKtLnkz3zpvCmEgf/HJW1F6YXTRh9KZRfkcvq wZOTdF6ZNSGffTWBa Content-Transfer-Encoding: quoted-printable X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200215_035027_514450_19D92DA6 X-CRM114-Status: UNSURE ( 8.14 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org Sender: "linux-riscv" Errors-To: linux-riscv-bounces+infradead-linux-riscv=archiver.kernel.org@lists.infradead.org From: Jan Kiszka This sets a memory limit provided via mem=3D on the command line, analogously to many other architectures. Signed-off-by: Jan Kiszka =2D-- arch/riscv/mm/init.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 965a8cf4829c..aec39a56d6cf 100644 =2D-- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -118,6 +118,23 @@ static void __init setup_initrd(void) } #endif /* CONFIG_BLK_DEV_INITRD */ +static phys_addr_t memory_limit =3D 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 =3D memparse(p, &p) & PAGE_MASK; + pr_notice("Memory limited to %lldMB\n", memory_limit >> 20); + + return 0; +} +early_param("mem", early_mem); + static phys_addr_t dtb_early_pa __initdata; void __init setup_bootmem(void) @@ -127,6 +144,8 @@ void __init setup_bootmem(void) phys_addr_t vmlinux_end =3D __pa_symbol(&_end); phys_addr_t vmlinux_start =3D __pa_symbol(&_start); + memblock_enforce_memory_limit(memory_limit); + /* Find the memory region containing the kernel */ for_each_memblock(memory, reg) { phys_addr_t end =3D reg->base + reg->size; =2D- 2.16.4