From f5bb124ecf34298246b4a776f2cf7545b1170638 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Date: Sat, 8 Feb 2020 17:56:36 +0100 Subject: [PATCH] hw/arm/raspi: Extract the RAM size from the board revision MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The board revision encode the amount of RAM. Add a helper to extract the RAM size, and use it. Since the amount of RAM is fixed (it is impossible to physically modify to have more or less RAM), do not allow sizes different than the one anounced by the manufacturer. Acked-by: Igor Mammedov Signed-off-by: Philippe Mathieu-Daudé Message-id: 20200208165645.15657-5-f4bug@amsat.org Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- hw/arm/raspi.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) diff --git a/hw/arm/raspi.c b/hw/arm/raspi.c index f285e2988f..dcd8d2d6d3 100644 --- a/hw/arm/raspi.c +++ b/hw/arm/raspi.c @@ -13,6 +13,7 @@ #include "qemu/osdep.h" #include "qemu/units.h" +#include "qemu/cutils.h" #include "qapi/error.h" #include "cpu.h" #include "hw/arm/bcm2836.h" @@ -49,6 +50,12 @@ FIELD(REV_CODE, MANUFACTURER, 16, 4); FIELD(REV_CODE, MEMORY_SIZE, 20, 3); FIELD(REV_CODE, STYLE, 23, 1); +static uint64_t board_ram_size(uint32_t board_rev) +{ + assert(FIELD_EX32(board_rev, REV_CODE, STYLE)); /* Only new style */ + return 256 * MiB << FIELD_EX32(board_rev, REV_CODE, MEMORY_SIZE); +} + static int board_processor_id(uint32_t board_rev) { assert(FIELD_EX32(board_rev, REV_CODE, STYLE)); /* Only new style */ @@ -191,15 +198,17 @@ static void raspi_init(MachineState *machine, uint32_t board_rev) { RasPiState *s = g_new0(RasPiState, 1); int version = board_version(board_rev); + uint64_t ram_size = board_ram_size(board_rev); uint32_t vcram_size; DriveInfo *di; BlockBackend *blk; BusState *bus; DeviceState *carddev; - if (machine->ram_size > 1 * GiB) { - error_report("Requested ram size is too large for this machine: " - "maximum is 1GB"); + if (machine->ram_size != ram_size) { + char *size_str = size_to_str(ram_size); + error_report("Invalid RAM size, should be %s", size_str); + g_free(size_str); exit(1); }