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GET /api/patches/813004/?format=api
HTTP 200 OK
Allow: GET, PUT, PATCH, HEAD, OPTIONS
Content-Type: application/json
Vary: Accept

{
    "id": 813004,
    "url": "http://patchwork.ozlabs.org/api/patches/813004/?format=api",
    "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/1505240046-11454-14-git-send-email-peter.maydell@linaro.org/",
    "project": {
        "id": 14,
        "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api",
        "name": "QEMU Development",
        "link_name": "qemu-devel",
        "list_id": "qemu-devel.nongnu.org",
        "list_email": "qemu-devel@nongnu.org",
        "web_url": "",
        "scm_url": "",
        "webscm_url": "",
        "list_archive_url": "",
        "list_archive_url_format": "",
        "commit_url_format": ""
    },
    "msgid": "<1505240046-11454-14-git-send-email-peter.maydell@linaro.org>",
    "list_archive_url": null,
    "date": "2017-09-12T18:14:00",
    "name": "[13/19] nvic: Implement v8M changes to fixed priority exceptions",
    "commit_ref": null,
    "pull_url": null,
    "state": "new",
    "archived": false,
    "hash": "4dcdec254f51e36fe393a04d3357ee3d2274e550",
    "submitter": {
        "id": 5111,
        "url": "http://patchwork.ozlabs.org/api/people/5111/?format=api",
        "name": "Peter Maydell",
        "email": "peter.maydell@linaro.org"
    },
    "delegate": null,
    "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/1505240046-11454-14-git-send-email-peter.maydell@linaro.org/mbox/",
    "series": [
        {
            "id": 2751,
            "url": "http://patchwork.ozlabs.org/api/series/2751/?format=api",
            "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=2751",
            "date": "2017-09-12T18:13:53",
            "name": "ARMv8M: support security extn in the NVIC",
            "version": 1,
            "mbox": "http://patchwork.ozlabs.org/series/2751/mbox/"
        }
    ],
    "comments": "http://patchwork.ozlabs.org/api/patches/813004/comments/",
    "check": "pending",
    "checks": "http://patchwork.ozlabs.org/api/patches/813004/checks/",
    "tags": {},
    "related": [],
    "headers": {
        "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>",
        "X-Original-To": "incoming@patchwork.ozlabs.org",
        "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org",
        "Authentication-Results": "ozlabs.org;\n\tspf=pass (mailfrom) smtp.mailfrom=nongnu.org\n\t(client-ip=2001:4830:134:3::11; helo=lists.gnu.org;\n\tenvelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org;\n\treceiver=<UNKNOWN>)",
        "Received": [
            "from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11])\n\t(using TLSv1 with cipher AES256-SHA (256/256 bits))\n\t(No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xsCxF2wnkz9s8J\n\tfor <incoming@patchwork.ozlabs.org>;\n\tWed, 13 Sep 2017 04:29:04 +1000 (AEST)",
            "from localhost ([::1]:38023 helo=lists.gnu.org)\n\tby lists.gnu.org with esmtp (Exim 4.71) (envelope-from\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>)\n\tid 1drpvf-00017h-LT\n\tfor incoming@patchwork.ozlabs.org; Tue, 12 Sep 2017 14:28:59 -0400",
            "from eggs.gnu.org ([2001:4830:134:3::10]:43576)\n\tby lists.gnu.org with esmtp (Exim 4.71)\n\t(envelope-from <pm215@archaic.org.uk>) id 1drph6-0003X3-5f\n\tfor qemu-devel@nongnu.org; Tue, 12 Sep 2017 14:13:57 -0400",
            "from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)\n\t(envelope-from <pm215@archaic.org.uk>) id 1drph4-0006UU-JY\n\tfor qemu-devel@nongnu.org; Tue, 12 Sep 2017 14:13:56 -0400",
            "from orth.archaic.org.uk ([2001:8b0:1d0::2]:37316)\n\tby eggs.gnu.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:32)\n\t(Exim 4.71) (envelope-from <pm215@archaic.org.uk>)\n\tid 1drph1-0006QF-4q; Tue, 12 Sep 2017 14:13:51 -0400",
            "from pm215 by orth.archaic.org.uk with local (Exim 4.89)\n\t(envelope-from <pm215@archaic.org.uk>)\n\tid 1drpgy-00018i-Ao; Tue, 12 Sep 2017 19:13:48 +0100"
        ],
        "From": "Peter Maydell <peter.maydell@linaro.org>",
        "To": "qemu-arm@nongnu.org,\n\tqemu-devel@nongnu.org",
        "Date": "Tue, 12 Sep 2017 19:14:00 +0100",
        "Message-Id": "<1505240046-11454-14-git-send-email-peter.maydell@linaro.org>",
        "X-Mailer": "git-send-email 2.7.4",
        "In-Reply-To": "<1505240046-11454-1-git-send-email-peter.maydell@linaro.org>",
        "References": "<1505240046-11454-1-git-send-email-peter.maydell@linaro.org>",
        "X-detected-operating-system": "by eggs.gnu.org: Genre and OS details not\n\trecognized.",
        "X-Received-From": "2001:8b0:1d0::2",
        "Subject": "[Qemu-devel] [PATCH 13/19] nvic: Implement v8M changes to fixed\n\tpriority exceptions",
        "X-BeenThere": "qemu-devel@nongnu.org",
        "X-Mailman-Version": "2.1.21",
        "Precedence": "list",
        "List-Id": "<qemu-devel.nongnu.org>",
        "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>",
        "List-Archive": "<http://lists.nongnu.org/archive/html/qemu-devel/>",
        "List-Post": "<mailto:qemu-devel@nongnu.org>",
        "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>",
        "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n\t<mailto:qemu-devel-request@nongnu.org?subject=subscribe>",
        "Cc": "patches@linaro.org",
        "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org",
        "Sender": "\"Qemu-devel\"\n\t<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>"
    },
    "content": "In v7M, the fixed-priority exceptions are:\n Reset: -3\n NMI: -2\n HardFault: -1\n\nIn v8M, this changes because Secure HardFault may need\nto be prioritised above NMI:\n Reset: -4\n Secure HardFault if AIRCR.BFHFNMINS == 1: -3\n NMI: -2\n Secure HardFault if AIRCR.BFHFNMINS == 0: -1\n NonSecure HardFault: -1\n\nMake these changes, including support for changing the\npriority of Secure HardFault as AIRCR.BFHFNMINS changes.\n\nSigned-off-by: Peter Maydell <peter.maydell@linaro.org>\n---\n hw/intc/armv7m_nvic.c | 22 +++++++++++++++++++---\n 1 file changed, 19 insertions(+), 3 deletions(-)",
    "diff": "diff --git a/hw/intc/armv7m_nvic.c b/hw/intc/armv7m_nvic.c\nindex c4670f7..db2f170 100644\n--- a/hw/intc/armv7m_nvic.c\n+++ b/hw/intc/armv7m_nvic.c\n@@ -937,6 +937,12 @@ static void nvic_writel(NVICState *s, uint32_t offset, uint32_t value,\n                     (R_V7M_AIRCR_SYSRESETREQS_MASK |\n                      R_V7M_AIRCR_BFHFNMINS_MASK |\n                      R_V7M_AIRCR_PRIS_MASK);\n+                /* BFHFNMINS changes the priority of Secure HardFault */\n+                if (cpu->env.v7m.aircr & R_V7M_AIRCR_BFHFNMINS_MASK) {\n+                    s->sec_vectors[ARMV7M_EXCP_HARD].prio = -3;\n+                } else {\n+                    s->sec_vectors[ARMV7M_EXCP_HARD].prio = -1;\n+                }\n             }\n             nvic_irq_update(s);\n         }\n@@ -1452,9 +1458,12 @@ static int nvic_post_load(void *opaque, int version_id)\n {\n     NVICState *s = opaque;\n     unsigned i;\n+    int resetprio;\n \n     /* Check for out of range priority settings */\n-    if (s->vectors[ARMV7M_EXCP_RESET].prio != -3 ||\n+    resetprio = arm_feature(&s->cpu->env, ARM_FEATURE_V8) ? -4 : -3;\n+\n+    if (s->vectors[ARMV7M_EXCP_RESET].prio != resetprio ||\n         s->vectors[ARMV7M_EXCP_NMI].prio != -2 ||\n         s->vectors[ARMV7M_EXCP_HARD].prio != -1) {\n         return 1;\n@@ -1497,7 +1506,12 @@ static int nvic_security_post_load(void *opaque, int version_id)\n     int i;\n \n     /* Check for out of range priority settings */\n-    if (s->sec_vectors[ARMV7M_EXCP_HARD].prio != -1) {\n+    if (s->sec_vectors[ARMV7M_EXCP_HARD].prio != -1\n+        && s->sec_vectors[ARMV7M_EXCP_HARD].prio != -3) {\n+        /* We can't cross-check against AIRCR.BFHFNMINS as we don't know\n+         * if the CPU state has been migrated yet; a mismatch won't\n+         * cause the emulation to blow up, though.\n+         */\n         return 1;\n     }\n     for (i = ARMV7M_EXCP_MEM; i < ARRAY_SIZE(s->sec_vectors); i++) {\n@@ -1544,6 +1558,7 @@ static Property props_nvic[] = {\n \n static void armv7m_nvic_reset(DeviceState *dev)\n {\n+    int resetprio;\n     NVICState *s = NVIC(dev);\n \n     s->vectors[ARMV7M_EXCP_NMI].enabled = 1;\n@@ -1556,7 +1571,8 @@ static void armv7m_nvic_reset(DeviceState *dev)\n     s->vectors[ARMV7M_EXCP_PENDSV].enabled = 1;\n     s->vectors[ARMV7M_EXCP_SYSTICK].enabled = 1;\n \n-    s->vectors[ARMV7M_EXCP_RESET].prio = -3;\n+    resetprio = arm_feature(&s->cpu->env, ARM_FEATURE_V8) ? -4 : -3;\n+    s->vectors[ARMV7M_EXCP_RESET].prio = resetprio;\n     s->vectors[ARMV7M_EXCP_NMI].prio = -2;\n     s->vectors[ARMV7M_EXCP_HARD].prio = -1;\n \n",
    "prefixes": [
        "13/19"
    ]
}