Re: [libre-riscv-dev] Handling Interrupts

diff --git a/37/d2f2c9cdd34dd15f56438a998d33a553db3010 b/37/d2f2c9cdd34dd15f56438a998d33a553db3010
new file mode 100644 (file)
index 0000000..cab1c72
--- /dev/null
+++ b/37/d2f2c9cdd34dd15f56438a998d33a553db3010
@@ -0,0 +1,124 @@
+Return-path: <libre-riscv-dev-bounces@lists.libre-riscv.org>
+Envelope-to: publicinbox@libre-riscv.org
+Delivery-date: Sat, 09 May 2020 20:42:59 +0100
+Received: from localhost ([::1] helo=libre-riscv.org)
+       by libre-soc.org with esmtp (Exim 4.89)
+       (envelope-from <libre-riscv-dev-bounces@lists.libre-riscv.org>)
+       id 1jXVNC-000640-Tj; Sat, 09 May 2020 20:42:58 +0100
+Received: from lkcl.net ([217.147.94.29])
+ by libre-soc.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
+ (Exim 4.89) (envelope-from <lkcl@lkcl.net>) id 1jXVNB-00063u-7k
+ for libre-riscv-dev@lists.libre-riscv.org; Sat, 09 May 2020 20:42:57 +0100
+DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lkcl.net;
+ s=201607131; 
+ h=Content-Transfer-Encoding:Content-Type:To:Subject:Message-ID:Date:From:In-Reply-To:References:MIME-Version;
+ bh=1hfEP7/U+92pD9pqTcwlgiNEJqdP2FkhfNAywH0khKU=; 
+ b=CpvmxEZFpypsJbwbJnSyV9LEJdNPS184kaDP2m1bohbbYdseuTImdjLesxrVIAmloRop9H43AKVD4c09iY7lSQTzMkNHkyTrn2ZZKti9PJYY9MXdYFV1/xzR5x3zKNqHE5oMKTcXt7x3rNrWuSqw30l8iqqR5lvx8ncc9uxGqSY=;
+Received: from mail-lj1-f176.google.com ([209.85.208.176])
+ by lkcl.net with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128)
+ (Exim 4.84_2) (envelope-from <lkcl@lkcl.net>) id 1jXVNA-0008Lv-PN
+ for libre-riscv-dev@lists.libre-riscv.org; Sat, 09 May 2020 19:42:57 +0000
+Received: by mail-lj1-f176.google.com with SMTP id h4so5229339ljg.12
+ for <libre-riscv-dev@lists.libre-riscv.org>;
+ Sat, 09 May 2020 12:42:41 -0700 (PDT)
+X-Gm-Message-State: AOAM531n43E+3J+YQPsLlBr1aBfMLGGY1A/UWESeyGdr1ZpbsX2LPCmZ
+ aLD5ukqQlqOH2ECZ45Rjk1eDn/Si0PAGZ0VypHY=
+X-Google-Smtp-Source: ABdhPJwhG+/WmP7lrW0f0adt0attUxSY9AWJjjOl4sIIQhnKkkCvdliBfUdksigvscL9gnFFjyMgV2K74g4NX8xZt0Q=
+X-Received: by 2002:a2e:9ac4:: with SMTP id p4mr5289655ljj.195.1589053355615; 
+ Sat, 09 May 2020 12:42:35 -0700 (PDT)
+MIME-Version: 1.0
+References: <BF4B573A-FB3D-48E0-9AFD-9921CC8F01C1@gatech.edu>
+In-Reply-To: <BF4B573A-FB3D-48E0-9AFD-9921CC8F01C1@gatech.edu>
+From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
+Date: Sat, 9 May 2020 20:42:24 +0100
+X-Gmail-Original-Message-ID: <CAPweEDzLQcYm_baVZEGGzEdGG_sqbhDVm1KUyz1qG3rrz5k7iw@mail.gmail.com>
+Message-ID: <CAPweEDzLQcYm_baVZEGGzEdGG_sqbhDVm1KUyz1qG3rrz5k7iw@mail.gmail.com>
+To: Libre-RISCV General Development <libre-riscv-dev@lists.libre-riscv.org>
+Subject: Re: [libre-riscv-dev] Handling Interrupts
+X-BeenThere: libre-riscv-dev@lists.libre-riscv.org
+X-Mailman-Version: 2.1.23
+Precedence: list
+List-Id: Libre-RISCV General Development
+ <libre-riscv-dev.lists.libre-riscv.org>
+List-Unsubscribe: <http://lists.libre-riscv.org/mailman/options/libre-riscv-dev>, 
+ <mailto:libre-riscv-dev-request@lists.libre-riscv.org?subject=unsubscribe>
+List-Archive: <http://lists.libre-riscv.org/pipermail/libre-riscv-dev/>
+List-Post: <mailto:libre-riscv-dev@lists.libre-riscv.org>
+List-Help: <mailto:libre-riscv-dev-request@lists.libre-riscv.org?subject=help>
+List-Subscribe: <http://lists.libre-riscv.org/mailman/listinfo/libre-riscv-dev>, 
+ <mailto:libre-riscv-dev-request@lists.libre-riscv.org?subject=subscribe>
+Reply-To: Libre-RISCV General Development
+ <libre-riscv-dev@lists.libre-riscv.org>
+Content-Type: text/plain; charset="utf-8"
+Content-Transfer-Encoding: base64
+Errors-To: libre-riscv-dev-bounces@lists.libre-riscv.org
+Sender: "libre-riscv-dev" <libre-riscv-dev-bounces@lists.libre-riscv.org>
+
+T24gU2F0LCBNYXkgOSwgMjAyMCBhdCA2OjI0IFBNIFllaG93c2h1YSA8eWltbWFudWVsM0BnYXRl
+Y2guZWR1PiB3cm90ZToKPgo+IE9uZSB0aGluZyBJIGp1c3QgcmVhbGl6ZWQgdGhhdCBJ4oCZdmUg
+bmV2ZXIgZG9uZSBpbiBhbnkgb2YgdGhlIFJUTCBDUFVzIEnigJl2ZSB3b3JrZWQgd2l0aCBpcyBl
+bmFibGUgaW50ZXJydXB0cy4KPgo+IEhvdyBhcmUgaW50ZXJydXB0cyBkb25lIGluIFJUTD8gQXMg
+c29vbiBhcyB0aGUgQ1BVIGNvbnRyb2xsZXIgc2VlcyB0aGF0IEVJTlQKPiBpcyBoaWdoLCBkb2Vz
+IGl0KHVwb24gdGhlIG5leHQgY2xvY2sgYm91bmRhcnkpLCBmbHVzaCB0aGUgcGlwZWxpbmUgYW5k
+Cj4gaW1tZWRpYXRlbHkganVtcCB0byB0aGUgaGFuZGxlcj8KCnRoZXJlJ3MgMiBvciAzIHdheXMg
+aXQgY2FuIGJlIGRvbmUsIHVsdGltYXRlbHkgdGhvdWdoIHRoZXkncmUgYXMKc2ltcGxlIGFzICJj
+aGFuZ2UgdGhlIFByb2dyYW0gQ291bnRlciBidXQgYWxzbyBhdXRvbWF0aWNhbGx5IHN0b3JlCmN1
+cnJlbnQgc3RhdGUgd2hlbiB0aGUgSU5UIGhhcmR3YXJlIGZsYWcgZ2V0cyByYWlzZWQiLiAgdGhh
+dCBzdGF0ZSBpcwp1c3VhbGx5IHRoZSBQcm9ncmFtIENvdW50ZXIgYW5kIHRoZSBjdXJyZW50ICJt
+b2RlIiAtClVzZXIvS2VybmVsL0h5cGVydmlzb3IuCgppdCB0aGVuIGJlY29tZXMgKGluIHNvZnR3
+YXJlKSB0aGUgcmVzcG9uc2liaWxpdHkgb2YgdGhlIHRyYXAgaGFuZGxlcgp0byBzYXZlIGZ1cnRo
+ZXIgY29udGV4dCBiZWNhdXNlIGluIGhhcmR3YXJlLCB0byBzYXZlIHRoaW5ncyBsaWtlICJ0aGUK
+ZW50aXJlIHJlZ2lzdGVyIGZpbGUiIGlzIGZhciB0b28gbWFueSBjeWNsZXMuICBwbHVzLCBtYW55
+IGZhc3QKaW50ZXJydXB0IGhhbmRsZXJzIGRvbid0ICpuZWVkKiB0byBzYXZlIHRoZSBlbnRpcmUg
+cmVnZmlsZSwgYmVjYXVzZQp0aGV5IG9ubHkgdXNlIGEgc3Vic2V0IG9mIHRoZSByZWdpc3RlcnMu
+CgpzbywgaW4gaGFyZHdhcmUsIHdoZW4gYW55IGtpbmQgb2YgImludGVycnVwdCIgY29uZGl0aW9u
+IG9jY3VycyAoYW4gSU5UCmxpbmUgc29tZXdoZXJlIGdvZXMgSEkpOgoKdGVjaG5pcXVlIDEpIGZ1
+cnRoZXIgaW5zdHJ1Y3Rpb24gaXNzdWUgaXMgcHJldmVudGVkIGFuZCBwcm9oaWJpdGVkLgpvdXRz
+dGFuZGluZyBpbi1mbGlnaHQgb3BlcmF0aW9ucyBjb250aW51ZSwgdW50aWwgdGhleSBhcmUgY29t
+cGxldGUuCm9uY2UgY29tcGxldGUsIHRoZSBpbnRlcnJ1cHQgImFjdGl2YXRlcyIgKGJ5IGNoYW5n
+aW5nIHRoZSBQQywgYW5kCmNoYW5naW5nIHRoZSBtb2RlLCBhbmQgc2F2aW5nIHRoZSByZXF1aXJl
+IG1pbmltYWwgc3RhdGUgaW50bwpDU1JzL1NQUnMpCgp0ZWNobmlxdWUgMikgcGlwZWxpbmVzIGFy
+ZSBwZXJtaXR0ZWQgdG8gYmUgImNhbmNlbGxlZCIgKGZsdXNoZWQpLgp0aGlzIG1lYW5zIHRoYXQg
+dGhlcmUgbXVzdCBleGlzdCBhIGdsb2JhbCAiY2FuY2VsbGF0aW9uIiBjb21iaW5hdG9yaWFsCnNp
+Z25hbCB0aGF0IHByb3BhZ2F0ZXMgdGhyb3VnaG91dCBldmVyeSBzaW5nbGUgcGlwZWxpbmUgc3Rh
+Z2UuCgp0ZWNobmlxdWUgMykgYW4gYXVnbWVudGVkIHZlcnNpb24gb2YgKDIpIHdoZXJlIGNlcnRh
+aW4gb3BlcmF0aW9ucwoocGFydGljdWxhcmx5IHRob3NlIHRoYXQgbWlnaHQgZG8gImRhbWFnZSIg
+aS5lLiBvbmNlIGluIHByb2dyZXNzIGNhbgppbiBubyB3YXkgYmUgInJvbGxlZCBiYWNrIiBzdWNo
+IGFzIG1lbW9yeSBvcGVyYXRpb25zIHRoYXQgaGF2ZSBhbHJlYWR5CmluaXRpYXRlZCB0aGUgcHJv
+Y2VzcyBvZiBjb21taXR0aW5nIGEgU1QgdG8gbWVtb3J5KSBoYXZlIGEgIm1hc2siCndoaWNoIGFi
+c29sdXRlbHkgcHJldmVudHMgYW5kIHByb2hpYml0cyB0aGUgaW50ZXJydXB0IC0gYW55IGludGVy
+cnVwdAotIGluY2x1ZGluZyBOTUlzIC0gZnJvbSB0YWtpbmcgcGxhY2UuCgp0ZWNobmlxdWUgNCkg
+YSBtdWNoIG1vcmUgc3VidGxlIHZlcnNpb24gb2YgKDMpIHdoZXJlIG9wZXJhdGlvbnMgYXJlCiJz
+aGFkb3dlZCIsIGkuZS4gb25seSB0aGUgKndyaXRlKiBwb3J0aW9uIG9mIHRoZSBvcGVyYXRpb24g
+aXMKcHJldmVudGVkIGFuZCBwcm9oaWJpdGVkIGZyb20gY29tbWl0dGluZyAod2hpbHN0IHRoZSBl
+eGVjdXRpb24gaXRzZWxmCi0gdGhlIGNvbXB1dGF0aW9uIG9mIHRoZSByZXN1bHQgLSBpcyBhbGxv
+d2VkIHRvIHByb2NlZWQgYW5kIGJlIHN0b3JlZAppbiBhIGxhdGNoKS4gIGlmIHRoZXJlIGlzIG5v
+IGV4Y2VwdGlvbiAtIGF0IGFsbCAtIGFuZCB0aGUgIndyaXRlIgpwb3J0aW9uIGlzIEFCU09MVVRF
+TFkgR1VBUkFOVEVFRCBUTyBTVUNDRUVELCB0aGVuIGFuZCBvbmx5IHRoZW4gaXMgdGhlCiJzaGFk
+b3ciIGxpZnRlZCwgYW5kIGFueSBpbnRlcnJ1cHQgdGhhdCBvY2N1cnMgcGFzdCB0aGF0IHBvaW50
+IG11c3QKd2FpdCBpdHMgdHVybi4KCnRlY2huaXF1ZSAxICphbmQqIDIgY29tZXMgaW50byBlZmZl
+Y3QgYXQgdGhhdCBwb2ludDogYW55dGhpbmcgdGhhdCBpcwpjdXJyZW50bHkgInNoYWRvd2VkIiBo
+YXMgaXRzIGdsb2JhbCAiY2FuY2VsIiBwdWxsZWQgKEdPX0RJRSksIHdoaWxzdAphbnl0aGluZyB0
+aGF0IGNhbiAqbm90KiBiZSBjYW5jZWxsZWQgbXVzdCBiZSB3YWl0ZWQgZm9yLgoKKDQpIGlzIHdo
+YXQgd2Ugd2lsbCBpbXBsZW1lbnQgLSBhbGwgdGhlIGluZnJhc3RydWN0dXJlIGlzIGluIHBsYWNl
+OgpnbG9iYWwgbWFzayBjYW5jZWxsYXRpb24gYml0bWFwcywgc2hhZG93aW5nLCBpdCdzIGFsbCB0
+aGVyZS4KCj4gSeKAmW0gYXdhcmUgdGhhdCB0aGVyZSBjYW4gYmUgZXh0ZXJuYWwgaGFyZHdhcmUg
+c3VjaCBhcyBhIFBMSUMgdG8gYXJiaXRyYXRlIGludGVycnVwdHMsCgp5ZXMuICB0aGF0J3MgYW5v
+dGhlciB0aGluZyB0aGF0IG5lZWRzIHRvIGdvIG9uIHRoZSBsaXN0LgoKPiBJ4oCZbSBqdXN0IG5v
+dCBjZXJ0YWluIGFib3V0IHRoZSBhY3R1YWwgQ1BVIFJUTCAtIHdoYXQgaXQgd291bGQgZG8uIFRo
+YXQgaXMsIGlmIHRoZSBDUFUgaW1tZWRpYXRlbHkKPiBqdW1wcyB0byB0aGUgaGFuZGxlciBhZGRy
+ZXNzIC0gb3IgaWYgaXQgYm90aGVycyB0byBzYXZlIGEgZmV3IHJlZ2lzdGVyIGZpcnN0CgpDU1Jz
+L1NQUnMgeWVzLiAgIHR5cGljYWxseSB0aGUgY3VycmVudCBQQyBpcyBzdG9yZWQgaW50byBhIENT
+Ui9TUFIgb2YKaXRzIG93bi4gIHRoaXMgd2lsbCBiZSB1c2VkIGFzIHRoZSAicmV0dXJuIGZyb20g
+dHJhcCIgYWRkcmVzcywgd2hlcmUKdGhlIGhhcmR3YXJlIHdpbGwsIG9uIGV4aXQgZnJvbSB0aGUg
+dHJhcCwgcmVzdG9yZSB0aGUgY3VycmVudCBQQyBmcm9tCnRoYXQgQ1NSL1NQUi4gIGFuZCByZXN0
+b3JlIHRoZSBjdXJyZW50ICJtb2RlIiAodXNlci9oeXBlcnZpc29yL2tlcm5lbAptb2RlKSBmcm9t
+IHRoZSBjb3JyZXNwb25kaW5nIFNQUi9DU1IgYXMgd2VsbC4KCj4gKCB0aGlzIG1pZ2h0IGRlcGVu
+ZCBvbiB0aGUgYWN0dWFsIElTQSBpdHNlbGYgdG9vKS4KCnllcyBpdCBkZXBlbmRzIG9uIHRoZSBJ
+U0EsIGhvd2V2ZXIgdGhlICJnb29kIiBvbmVzIG1pbmltaXNlIHRoZSBhbW91bnQKb2Ygc3RhdGUg
+dGhhdCBnZXRzICJzd2FwcGVkIiBpbnRvIENTUnMgYW5kIGxldHMgdGhlIHNvZnR3YXJlICh0cmFw
+CmhhbmRsZXIpIHNvcnQgaXQgb3V0LgoKbC4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19f
+X19fX19fX19fX19fX19fX19fCmxpYnJlLXJpc2N2LWRldiBtYWlsaW5nIGxpc3QKbGlicmUtcmlz
+Y3YtZGV2QGxpc3RzLmxpYnJlLXJpc2N2Lm9yZwpodHRwOi8vbGlzdHMubGlicmUtcmlzY3Yub3Jn
+L21haWxtYW4vbGlzdGluZm8vbGlicmUtcmlzY3YtZGV2Cg==
+