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Re: Are pages allowed to cross PMA regions?

That could be ok for accesses to idempotent memory, but would likely be problematic for a non-idempotent location (e.g. a memory-mapped I/O register), and byte accesses to a word MMIO register might

By Greg Favor · #1115 ·

Re: Are pages allowed to cross PMA regions?

It would be nice if it was architecturally defined/permitted for such straddling accesses to be performed a byte at a time. That makes the trap and emulate handler easier to code. If not a byte at a

By Andy Glew (Gmail) <andyglew@...> · #1114 ·

Re: Are pages allowed to cross PMA regions?

| Can a virtual paged be mapped to addresses that cross PMA regions? For example, is it acceptable to map a 1GB page such that half its physical addresses have the (e.g.) cacheable | attribute

By Krste Asanovic · #1113 ·

Re: Are pages allowed to cross PMA regions?

The PMA architecture allows a lot of implementation flexibility - including for example having small 4B regions. In that example one could easily have one 4KB page overlap multiple PMA

By Greg Favor · #1112 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

I'm getting there Andy. We have picked this back up recently and had a few meetings on it. How many years has it been? Too bloody many, but this will end this year. That sort of thing happens when I

By striker@... · #1111 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

This is a now active effort again in the J group. Derek has led discussions on selected aspects in some of the recent meetings. Greg

By Greg Favor · #1110 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Derek, what's the status of taking your slides and turning them into an architecture spec? Who is actually doing that? How many years has it been already? __________________________________ |

By Andy Glew (Gmail) <andyglew@...> · #1109 ·

Re: Are pages allowed to cross PMA regions?

I cannot say what the RISC-V rule is but I can provide example use cases for similar issues from other architectures. (1) Legacy MMIO map (2) non-legacy MMIOmap with huge, larger and larger pages /

By Andy Glew (Gmail) <andyglew@...> · #1108 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

OK Guy, I agree, let's try to move this forward. For that to happen you're going to need to do a fair amount of reading. Smiles, I've been anything but opaque on this subject, please see the attached

By striker@... · #1107 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Folks -- This email thread is getting long and my inbox is getting full. I suggest that interested parties get the J group's proposal slide deck from Derek, and frame their questions and needs

By John Ingalls · #1106 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Hi Guy, thanks for the email thread. Very interesting. I am hoping to get a precise understanding of 1) Your high level need, and 2) The details of the semantics you are asking for. I do need to say

By Sean Halle · #1105 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Guy -- Have you read Derek's slide deck that he prepared for the J group on this? I believe it contains the answers and solutions that you are looking for. -- John

By John Ingalls · #1104 ·

Are pages allowed to cross PMA regions?

Hello, There is something unclear to me after reading the PMA section or the Privileged ISA manual (i.e. Section 3.6). Can a virtual paged be mapped to addresses that cross PMA regions? For example,

By Andres Amaya Garcia · #1103 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Derek, let's try to move the discussion forward instead of just back and forth. If the J extension will solve this problem, please describe how? You've been very opaque -- is that because it hasn't

By Guy Lemieux <guy.lemieux@...> · #1102 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Thank you for this email Guy. It clarifies many things. From: Mark Himelstein <markhimelstein@...> Sent: Thursday, August 11, 2022 9:01 AM To: tech-cmo@... Group Moderators <tech-cmo@...>; Guy

By striker@... · #1101 ·

Re: [RISC-V] [tech-virt-mem] Help needed on physical address issues

Thanks again to everyone! These answers make sense to me.

By Ke Chai · #1100 ·

Re: [RISC-V] [tech-virt-mem] Help needed on physical address issues

My earlier statement about PAs conceptually or architecturally being viewed as zero-extended values makes them agnostic to implemented PA size. In general, and irrespective of where a PA comes from

By Greg Favor · #1099 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

Hi Krste, Dumping the entire i-cache via FENCE.I is different. I am requesting invalidation of a single cache block from the i-cache. The Zifencei spec recognizes Zifencei is expensive to

By Guy Lemieux <guy.lemieux@...> · #1098 ·

Re: [RISC-V] [tech-cmo] [riscv-CMOs:master] reported: Can CMO extension support icache management? #github #risv #cmos

| +tech-privileged | On Thu, Aug 11, 2022 at 6:48 AM Guy Lemieux <guy.lemieux@...> wrote: | On Wed, Aug 10, 2022 at 10:39 PM Derek Williams <striker@...> wrote: || You say below

By Krste Asanovic · #1097 ·

Re: [RISC-V] [tech-virt-mem] Help needed on physical address issues

My understanding is that the physical address size is implementation dependent. Iif any bit above that is set, it should report an access fault. The ACTs don't specifically test for that now, but

By Allen Baum · #1096 ·

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